<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category  Zend
 * @package   Zend_Date
 * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd     New BSD License
 * @version   $Id: Date.php 17696 2009-08-20 20:12:33Z thomas $
 */

/**
 * Include needed Date classes
 */
require_once 'Zend/Date/DateObject.php';
require_once 'Zend/Locale.php';
require_once 'Zend/Locale/Format.php';
require_once 'Zend/Locale/Math.php';

/**
 * @category  Zend
 * @package   Zend_Date
 * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Date extends Zend_Date_DateObject
{
	private $_locale  = null;

	// Fractional second variables
	private $_fractional = 0;
	private $_precision  = 3;

	private static $_options = array(
        'format_type'  => 'iso',      // format for date strings 'iso' or 'php'
        'fix_dst'      => true,       // fix dst on summer/winter time change
        'extend_month' => false,      // false - addMonth like SQL, true like excel
        'cache'        => null,       // cache to set
        'timesync'     => null        // timesync server to set
	);

	// Class wide Date Constants
	const DAY               = 'dd';
	const DAY_SHORT         = 'd';
	const DAY_SUFFIX        = 'SS';
	const DAY_OF_YEAR       = 'D';
	const WEEKDAY           = 'EEEE';
	const WEEKDAY_SHORT     = 'EEE';
	const WEEKDAY_NARROW    = 'E';
	const WEEKDAY_NAME      = 'EE';
	const WEEKDAY_8601      = 'eee';
	const WEEKDAY_DIGIT     = 'e';
	const WEEK              = 'ww';
	const MONTH             = 'MM';
	const MONTH_SHORT       = 'M';
	const MONTH_DAYS        = 'ddd';
	const MONTH_NAME        = 'MMMM';
	const MONTH_NAME_SHORT  = 'MMM';
	const MONTH_NAME_NARROW = 'MMMMM';
	const YEAR              = 'y';
	const YEAR_SHORT        = 'yy';
	const YEAR_8601         = 'Y';
	const YEAR_SHORT_8601   = 'YY';
	const LEAPYEAR          = 'l';
	const MERIDIEM          = 'a';
	const SWATCH            = 'B';
	const HOUR              = 'HH';
	const HOUR_SHORT        = 'H';
	const HOUR_AM           = 'hh';
	const HOUR_SHORT_AM     = 'h';
	const MINUTE            = 'mm';
	const MINUTE_SHORT      = 'm';
	const SECOND            = 'ss';
	const SECOND_SHORT      = 's';
	const MILLISECOND       = 'S';
	const TIMEZONE_NAME     = 'zzzz';
	const DAYLIGHT          = 'I';
	const GMT_DIFF          = 'Z';
	const GMT_DIFF_SEP      = 'ZZZZ';
	const TIMEZONE          = 'z';
	const TIMEZONE_SECS     = 'X';
	const ISO_8601          = 'c';
	const RFC_2822          = 'r';
	const TIMESTAMP         = 'U';
	const ERA               = 'G';
	const ERA_NAME          = 'GGGG';
	const ERA_NARROW        = 'GGGGG';
	const DATES             = 'F';
	const DATE_FULL         = 'FFFFF';
	const DATE_LONG         = 'FFFF';
	const DATE_MEDIUM       = 'FFF';
	const DATE_SHORT        = 'FF';
	const TIMES             = 'WW';
	const TIME_FULL         = 'TTTTT';
	const TIME_LONG         = 'TTTT';
	const TIME_MEDIUM       = 'TTT';
	const TIME_SHORT        = 'TT';
	const DATETIME          = 'K';
	const DATETIME_FULL     = 'KKKKK';
	const DATETIME_LONG     = 'KKKK';
	const DATETIME_MEDIUM   = 'KKK';
	const DATETIME_SHORT    = 'KK';
	const ATOM              = 'OOO';
	const COOKIE            = 'CCC';
	const RFC_822           = 'R';
	const RFC_850           = 'RR';
	const RFC_1036          = 'RRR';
	const RFC_1123          = 'RRRR';
	const RFC_3339          = 'RRRRR';
	const RSS               = 'SSS';
	const W3C               = 'WWW';

	/**
	 * Generates the standard date object, could be a unix timestamp, localized date,
	 * string, integer, array and so on. Also parts of dates or time are supported
	 * Always set the default timezone: http://php.net/date_default_timezone_set
	 * For example, in your bootstrap: date_default_timezone_set('America/Los_Angeles');
	 * For detailed instructions please look in the docu.
	 *
	 * @param  string|integer|Zend_Date|array  $date    OPTIONAL Date value or value of date part to set
	 *                                                 ,depending on $part. If null the actual time is set
	 * @param  string                          $part    OPTIONAL Defines the input format of $date
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 * @throws Zend_Date_Exception
	 */
	public function __construct($date = null, $part = null, $locale = null)
	{
		if (is_object($date) and !($date instanceof Zend_TimeSync_Protocol) and
		!($date instanceof Zend_Date)) {
			if ($locale instanceof Zend_Locale) {
				$locale = $date;
				$date   = null;
				$part   = null;
			} else {
				$date = (string) $date;
			}
		}

		if (($date !== null) and !is_array($date) and !($date instanceof Zend_TimeSync_Protocol) and
		!($date instanceof Zend_Date) and !defined($date) and Zend_Locale::isLocale($date, true, false)) {
			$locale = $date;
			$date   = null;
			$part   = null;
		} else if (($part !== null) and !defined($part) and Zend_Locale::isLocale($part, true, false)) {
			$locale = $part;
			$part   = null;
		}

		$this->setLocale($locale);
		if (is_string($date) && ($part === null) && (strlen($date) <= 5)) {
			$part = $date;
			$date = null;
		}

		if ($date === null) {
			if ($part === null) {
				$date = time();
			} else if ($part !== self::TIMESTAMP) {
				$date = self::now($locale);
				$date = $date->get($part);
			}
		}

		if ($date instanceof Zend_TimeSync_Protocol) {
			$date = $date->getInfo();
			$date = $this->_getTime($date['offset']);
			$part = null;
		} else if (parent::$_defaultOffset != 0) {
			$date = $this->_getTime(parent::$_defaultOffset);
		}

		// set the timezone and offset for $this
		$zone = @date_default_timezone_get();
		$this->setTimezone($zone);

		// try to get timezone from date-string
		if (!is_int($date)) {
			$zone = $this->getTimezoneFromString($date);
			$this->setTimezone($zone);
		}

		// set datepart
		if (($part !== null && $part !== self::TIMESTAMP) or (!is_numeric($date))) {
			// switch off dst handling for value setting
			$this->setUnixTimestamp($this->getGmtOffset());
			$this->set($date, $part, $this->_locale);

			// DST fix
			if (is_array($date) === true) {
				if (!isset($date['hour'])) {
					$date['hour'] = 0;
				}

				$hour = $this->toString('H');
				$hour = $date['hour'] - $hour;
				switch ($hour) {
					case 1 :
					case -23 :
						$this->addTimestamp(3600);
						break;
					case -1 :
					case 23 :
						$this->subTimestamp(3600);
						break;
					case 2 :
					case -22 :
						$this->addTimestamp(7200);
						break;
					case -2 :
					case 22 :
						$this->subTimestamp(7200);
						break;
				}
			}
		} else {
			$this->setUnixTimestamp($date);
		}
	}

	/**
	 * Sets class wide options, if no option was given, the actual set options will be returned
	 *
	 * @param  array  $options  Options to set
	 * @throws Zend_Date_Exception
	 * @return Options array if no option was given
	 */
	public static function setOptions(array $options = array())
	{
		if (empty($options)) {
			return self::$_options;
		}
		foreach ($options as $name => $value) {
			$name  = strtolower($name);

			if (array_key_exists($name, self::$_options)) {
				switch($name) {
					case 'format_type' :
						if ((strtolower($value) != 'php') && (strtolower($value) != 'iso')) {
							require_once 'Zend/Date/Exception.php';
							throw new Zend_Date_Exception("Unknown format type ($value) for dates, only 'iso' and 'php' supported", $value);
						}
						break;
					case 'fix_dst' :
						if (!is_bool($value)) {
							require_once 'Zend/Date/Exception.php';
							throw new Zend_Date_Exception("'fix_dst' has to be boolean", $value);
						}
						break;
					case 'extend_month' :
						if (!is_bool($value)) {
							require_once 'Zend/Date/Exception.php';
							throw new Zend_Date_Exception("'extend_month' has to be boolean", $value);
						}
						break;
					case 'cache' :
						if (!$value instanceof Zend_Cache_Core) {
							require_once 'Zend/Date/Exception.php';
							throw new Zend_Date_Exception("Instance of Zend_Cache expected");
						}
						parent::$_cache = $value;
						Zend_Locale_Data::setCache($value);
						break;
					case 'timesync' :
						if (!$value instanceof Zend_TimeSync_Protocol) {
							require_once 'Zend/Date/Exception.php';
							throw new Zend_Date_Exception("Instance of Zend_TimeSync expected");
						}
						$date = $value->getInfo();
						parent::$_defaultOffset = $date['offset'];
						break;
				}
				self::$_options[$name] = $value;
			}
			else {
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("Unknown option: $name = $value");
			}
		}
	}

	/**
	 * Returns this object's internal UNIX timestamp (equivalent to Zend_Date::TIMESTAMP).
	 * If the timestamp is too large for integers, then the return value will be a string.
	 * This function does not return the timestamp as an object.
	 * Use clone() or copyPart() instead.
	 *
	 * @return integer|string  UNIX timestamp
	 */
	public function getTimestamp()
	{
		return $this->getUnixTimestamp();
	}

	/**
	 * Returns the calculated timestamp
	 * HINT: timestamps are always GMT
	 *
	 * @param  string                          $calc    Type of calculation to make
	 * @param  string|integer|array|Zend_Date  $stamp   Timestamp to calculate, when null the actual timestamp is calculated
	 * @return Zend_Date|integer
	 * @throws Zend_Date_Exception
	 */
	private function _timestamp($calc, $stamp)
	{
		if ($stamp instanceof Zend_Date) {
			// extract timestamp from object
			$stamp = $stamp->get(self::TIMESTAMP, true);
		}

		if (is_array($stamp)) {
			if (isset($stamp['timestamp']) === true) {
				$stamp = $stamp['timestamp'];
			} else {
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('no timestamp given in array');
			}
		}

		if ($calc === 'set') {
			$return = $this->setUnixTimestamp($stamp);
		} else {
			$return = $this->_calcdetail($calc, $stamp, self::TIMESTAMP, null);
		}
		if ($calc != 'cmp') {
			return $this;
		}
		return $return;
	}

	/**
	 * Sets a new timestamp
	 *
	 * @param  integer|string|array|Zend_Date  $timestamp  Timestamp to set
	 * @return Zend_Date
	 * @throws Zend_Date_Exception
	 */
	public function setTimestamp($timestamp)
	{
		return $this->_timestamp('set', $timestamp);
	}

	/**
	 * Adds a timestamp
	 *
	 * @param  integer|string|array|Zend_Date  $timestamp  Timestamp to add
	 * @return Zend_Date
	 * @throws Zend_Date_Exception
	 */
	public function addTimestamp($timestamp)
	{
		return $this->_timestamp('add', $timestamp);
	}

	/**
	 * Subtracts a timestamp
	 *
	 * @param  integer|string|array|Zend_Date  $timestamp  Timestamp to sub
	 * @return Zend_Date
	 * @throws Zend_Date_Exception
	 */
	public function subTimestamp($timestamp)
	{
		return $this->_timestamp('sub', $timestamp);
	}

	/**
	 * Compares two timestamps, returning the difference as integer
	 *
	 * @param  integer|string|array|Zend_Date  $timestamp  Timestamp to compare
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareTimestamp($timestamp)
	{
		return $this->_timestamp('cmp', $timestamp);
	}

	/**
	 * Returns a string representation of the object
	 * Supported format tokens are:
	 * G - era, y - year, Y - ISO year, M - month, w - week of year, D - day of year, d - day of month
	 * E - day of week, e - number of weekday (1-7), h - hour 1-12, H - hour 0-23, m - minute, s - second
	 * A - milliseconds of day, z - timezone, Z - timezone offset, S - fractional second, a - period of day
	 *
	 * Additionally format tokens but non ISO conform are:
	 * SS - day suffix, eee - php number of weekday(0-6), ddd - number of days per month
	 * l - Leap year, B - swatch internet time, I - daylight saving time, X - timezone offset in seconds
	 * r - RFC2822 format, U - unix timestamp
	 *
	 * Not supported ISO tokens are
	 * u - extended year, Q - quarter, q - quarter, L - stand alone month, W - week of month
	 * F - day of week of month, g - modified julian, c - stand alone weekday, k - hour 0-11, K - hour 1-24
	 * v - wall zone
	 *
	 * @param  string              $format  OPTIONAL Rule for formatting output. If null the default date format is used
	 * @param  string              $type    OPTIONAL Type for the format string which overrides the standard setting
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return string
	 */
	public function toString($format = null, $type = null, $locale = null)
	{
		if (is_object($format)) {
			if ($format instanceof Zend_Locale) {
				$locale = $format;
				$format = null;
			} else {
				$format = (string) $format;
			}
		}

		if (is_object($type)) {
			if ($type instanceof Zend_Locale) {
				$locale = $type;
				$type   = null;
			} else {
				$type = (string) $type;
			}
		}

		if (($format !== null) and !defined($format) and
		($format != 'ee') and ($format != 'ss') and Zend_Locale::isLocale($format, null, false)) {
			$locale = $format;
			$format = null;
		}

		if (($type !== null) and ($type != 'php') and ($type != 'iso') and
		Zend_Locale::isLocale($type, null, false)) {
			$locale = $type;
			$type = null;
		}

		if ($locale === null) {
			$locale = $this->getLocale();
		}

		if ($format === null) {
			$format = Zend_Locale_Format::getDateFormat($locale) . ' ' . Zend_Locale_Format::getTimeFormat($locale);
		} else if (((self::$_options['format_type'] == 'php') && ($type === null)) or ($type == 'php')) {
			$format = Zend_Locale_Format::convertPhpToIsoFormat($format);
		}

		return $this->get($format, $locale);
	}

	/**
	 * Returns a string representation of the date which is equal with the timestamp
	 *
	 * @return string
	 */
	public function __toString()
	{
		return $this->toString(null, $this->_locale);
	}

	/**
	 * Returns a integer representation of the object
	 * But returns false when the given part is no value f.e. Month-Name
	 *
	 * @param  string|integer|Zend_Date  $part  OPTIONAL Defines the date or datepart to return as integer
	 * @return integer|false
	 */
	public function toValue($part = null)
	{
		$result = $this->get($part);
		if (is_numeric($result)) {
			return intval("$result");
		} else {
			return false;
		}
	}

	/**
	 * Returns an array representation of the object
	 *
	 * @return array
	 */
	public function toArray()
	{
		return array('day'       => $this->get(self::DAY_SHORT),
                     'month'     => $this->get(self::MONTH_SHORT),
                     'year'      => $this->get(self::YEAR),
                     'hour'      => $this->get(self::HOUR_SHORT),
                     'minute'    => $this->get(self::MINUTE_SHORT),
                     'second'    => $this->get(self::SECOND_SHORT),
                     'timezone'  => $this->get(self::TIMEZONE),
                     'timestamp' => $this->get(self::TIMESTAMP),
                     'weekday'   => $this->get(self::WEEKDAY_8601),
                     'dayofyear' => $this->get(self::DAY_OF_YEAR),
                     'week'      => $this->get(self::WEEK),
                     'gmtsecs'   => $this->get(self::TIMEZONE_SECS));
	}

	/**
	 * Returns a representation of a date or datepart
	 * This could be for example a localized monthname, the time without date,
	 * the era or only the fractional seconds. There are about 50 different supported date parts.
	 * For a complete list of supported datepart values look into the docu
	 *
	 * @param  string              $part    OPTIONAL Part of the date to return, if null the timestamp is returned
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return string  date or datepart
	 */
	public function get($part = null, $locale = null)
	{
		if ($locale === null) {
			$locale = $this->getLocale();
		}

		if (($part !== null) && (strlen($part) !== 2) && (Zend_Locale::isLocale($part, null, false))) {
			$locale = $part;
			$part = null;
		}

		if ($part === null) {
			$part = self::TIMESTAMP;
		}

		return $this->date($this->_toToken($part, $locale), $this->getUnixTimestamp(), false);
	}

	/**
	 * Internal method to apply tokens
	 *
	 * @param string $part
	 * @param string $locale
	 * @return string
	 */
	private function _toToken($part, $locale) {
		// get format tokens
		$comment = false;
		$format  = '';
		$orig    = '';
		for ($i = 0; $i < strlen($part); ++$i) {
			if ($part[$i] == "'") {
				$comment = $comment ? false : true;
				if (isset($part[$i+1]) && ($part[$i+1] == "'")) {
					$comment = $comment ? false : true;
					$format .= "\\'";
					++$i;
				}

				$orig = '';
				continue;
			}

			if ($comment) {
				$format .= '\\' . $part[$i];
				$orig = '';
			} else {
				$orig .= $part[$i];
				if (!isset($part[$i+1]) || (isset($orig[0]) && ($orig[0] != $part[$i+1]))) {
					$format .= $this->_parseIsoToDate($orig, $locale);
					$orig  = '';
				}
			}
		}

		return $format;
	}

	/**
	 * Internal parsing method
	 *
	 * @param string $token
	 * @param string $locale
	 * @return string
	 */
	private function _parseIsoToDate($token, $locale) {
		switch($token) {
			case self::DAY :
				return 'd';
				break;

			case self::WEEKDAY_SHORT :
				$weekday = strtolower($this->date('D', $this->getUnixTimestamp(), false));
				$day     = Zend_Locale_Data::getContent($locale, 'day', array('gregorian', 'format', 'wide', $weekday));
				return $this->_toComment(iconv_substr($day, 0, 3, 'UTF-8'));
				break;

			case self::DAY_SHORT :
				return 'j';
				break;

			case self::WEEKDAY :
				$weekday = strtolower($this->date('D', $this->getUnixTimestamp(), false));
				return $this->_toComment(Zend_Locale_Data::getContent($locale, 'day', array('gregorian', 'format', 'wide', $weekday)));
				break;

			case self::WEEKDAY_8601 :
				return 'N';
				break;

			case 'ee' :
				return $this->_toComment(str_pad($this->date('N', $this->getUnixTimestamp(), false), 2, '0', STR_PAD_LEFT));
				break;

			case self::DAY_SUFFIX :
				return 'S';
				break;

			case self::WEEKDAY_DIGIT :
				return 'w';
				break;

			case self::DAY_OF_YEAR :
				return 'z';
				break;

			case 'DDD' :
				return $this->_toComment(str_pad($this->date('z', $this->getUnixTimestamp(), false), 3, '0', STR_PAD_LEFT));
				break;

			case 'DD' :
				return $this->_toComment(str_pad($this->date('z', $this->getUnixTimestamp(), false), 2, '0', STR_PAD_LEFT));
				break;

			case self::WEEKDAY_NARROW :
			case 'EEEEE' :
				$weekday = strtolower($this->date('D', $this->getUnixTimestamp(), false));
				$day = Zend_Locale_Data::getContent($locale, 'day', array('gregorian', 'format', 'abbreviated', $weekday));
				return $this->_toComment(iconv_substr($day, 0, 1, 'UTF-8'));
				break;

			case self::WEEKDAY_NAME :
				$weekday = strtolower($this->date('D', $this->getUnixTimestamp(), false));
				return $this->_toComment(Zend_Locale_Data::getContent($locale, 'day', array('gregorian', 'format', 'abbreviated', $weekday)));
				break;

			case 'w' :
				$week = $this->date('W', $this->getUnixTimestamp(), false);
				return $this->_toComment(($week[0] == '0') ? $week[1] : $week);
				break;

			case self::WEEK :
				return 'W';
				break;

			case self::MONTH_NAME :
				$month = $this->date('n', $this->getUnixTimestamp(), false);
				return $this->_toComment(Zend_Locale_Data::getContent($locale, 'month', array('gregorian', 'format', 'wide', $month)));
				break;

			case self::MONTH :
				return 'm';
				break;

			case self::MONTH_NAME_SHORT :
				$month = $this->date('n', $this->getUnixTimestamp(), false);
				return $this->_toComment(Zend_Locale_Data::getContent($locale, 'month', array('gregorian', 'format', 'abbreviated', $month)));
				break;

			case self::MONTH_SHORT :
				return 'n';
				break;

			case self::MONTH_DAYS :
				return 't';
				break;

			case self::MONTH_NAME_NARROW :
				$month = $this->date('n', $this->getUnixTimestamp(), false);
				$mon = Zend_Locale_Data::getContent($locale, 'month', array('gregorian', 'format', 'abbreviated', $month));
				return $this->_toComment(iconv_substr($mon, 0, 1, 'UTF-8'));
				break;

			case self::LEAPYEAR :
				return 'L';
				break;

			case self::YEAR_8601 :
				return 'o';
				break;

			case self::YEAR :
				return 'Y';
				break;

			case self::YEAR_SHORT :
				return 'y';
				break;

			case self::YEAR_SHORT_8601 :
				return $this->_toComment(substr($this->date('o', $this->getUnixTimestamp(), false), -2, 2));
				break;

			case self::MERIDIEM :
				$am = $this->date('a', $this->getUnixTimestamp(), false);
				if ($am == 'am') {
					return $this->_toComment(Zend_Locale_Data::getContent($locale, 'am'));
				}

				return $this->_toComment(Zend_Locale_Data::getContent($locale, 'pm'));
				break;

			case self::SWATCH :
				return 'B';
				break;

			case self::HOUR_SHORT_AM :
				return 'g';
				break;

			case self::HOUR_SHORT :
				return 'G';
				break;

			case self::HOUR_AM :
				return 'h';
				break;

			case self::HOUR :
				return 'H';
				break;

			case self::MINUTE :
				return $this->_toComment(str_pad($this->date('i', $this->getUnixTimestamp(), false), 2, '0', STR_PAD_LEFT));
				break;

			case self::SECOND :
				return $this->_toComment(str_pad($this->date('s', $this->getUnixTimestamp(), false), 2, '0', STR_PAD_LEFT));
				break;

			case self::MINUTE_SHORT :
				return 'i';
				break;

			case self::SECOND_SHORT :
				return 's';
				break;

			case self::MILLISECOND :
				return $this->_toComment($this->_fractional);
				break;

			case self::TIMEZONE_NAME :
			case 'vvvv' :
				return 'e';
				break;

			case self::DAYLIGHT :
				return 'I';
				break;

			case self::GMT_DIFF :
			case 'ZZ' :
			case 'ZZZ' :
				return 'O';
				break;

			case self::GMT_DIFF_SEP :
				return 'P';
				break;

			case self::TIMEZONE :
			case 'v' :
			case 'zz' :
			case 'zzz' :
				return 'T';
				break;

			case self::TIMEZONE_SECS :
				return 'Z';
				break;

			case self::ISO_8601 :
				return 'c';
				break;

			case self::RFC_2822 :
				return 'r';
				break;

			case self::TIMESTAMP :
				return 'U';
				break;

			case self::ERA :
			case 'GG' :
			case 'GGG' :
				$year = $this->date('Y', $this->getUnixTimestamp(), false);
				if ($year < 0) {
					return $this->_toComment(Zend_Locale_Data::getContent($locale, 'era', array('gregorian', 'Abbr', '0')));
				}

				return $this->_toComment(Zend_Locale_Data::getContent($locale, 'era', array('gregorian', 'Abbr', '1')));
				break;

			case self::ERA_NARROW :
				$year = $this->date('Y', $this->getUnixTimestamp(), false);
				if ($year < 0) {
					return $this->_toComment(iconv_substr(Zend_Locale_Data::getContent($locale, 'era', array('gregorian', 'Abbr', '0')), 0, 1, 'UTF-8')) . '.';
				}

				return $this->_toComment(iconv_substr(Zend_Locale_Data::getContent($locale, 'era', array('gregorian', 'Abbr', '1')), 0, 1, 'UTF-8')) . '.';
				break;

			case self::ERA_NAME :
				$year = $this->date('Y', $this->getUnixTimestamp(), false);
				if ($year < 0) {
					return $this->_toComment(Zend_Locale_Data::getContent($locale, 'era', array('gregorian', 'Names', '0')));
				}

				return $this->_toComment(Zend_Locale_Data::getContent($locale, 'era', array('gregorian', 'Names', '1')));
				break;

			case self::DATES :
				return $this->_toToken(Zend_Locale_Format::getDateFormat($locale), $locale);
				break;

			case self::DATE_FULL :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'full')), $locale);
				break;

			case self::DATE_LONG :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'long')), $locale);
				break;

			case self::DATE_MEDIUM :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'medium')), $locale);
				break;

			case self::DATE_SHORT :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'short')), $locale);
				break;

			case self::TIMES :
				return $this->_toToken(Zend_Locale_Format::getTimeFormat($locale), $locale);
				break;

			case self::TIME_FULL :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'time', 'full'), $locale);
				break;

			case self::TIME_LONG :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'time', 'long'), $locale);
				break;

			case self::TIME_MEDIUM :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'time', 'medium'), $locale);
				break;

			case self::TIME_SHORT :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'time', 'short'), $locale);
				break;

			case self::DATETIME :
				return $this->_toToken(Zend_Locale_Format::getDateTimeFormat($locale), $locale);
				break;

			case self::DATETIME_FULL :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'full')), $locale);
				break;

			case self::DATETIME_LONG :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'long')), $locale);
				break;

			case self::DATETIME_MEDIUM :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'medium')), $locale);
				break;

			case self::DATETIME_SHORT :
				return $this->_toToken(Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'short')), $locale);
				break;

			case self::ATOM :
				return 'Y\-m\-d\TH\:i\:sP';
				break;

			case self::COOKIE :
				return 'l\, d\-M\-y H\:i\:s e';
				break;

			case self::RFC_822 :
				return 'D\, d M y H\:i\:s O';
				break;

			case self::RFC_850 :
				return 'l\, d\-M\-y H\:i\:s e';
				break;

			case self::RFC_1036 :
				return 'D\, d M y H\:i\:s O';
				break;

			case self::RFC_1123 :
				return 'D\, d M Y H\:i\:s O';
				break;

			case self::RFC_3339 :
				return 'Y\-m\-d\TH\:i\:sP';
				break;

			case self::RSS :
				return 'D\, d M Y H\:i\:s O';
				break;

			case self::W3C :
				return 'Y\-m\-d\TH\:i\:sP';
				break;
		}

		if ($token == '') {
			return '';
		}

		switch ($token[0]) {
			case 'y' :
				if ((strlen($token) == 4) && (abs($this->getUnixTimestamp()) <= 0x7FFFFFFF)) {
					return 'Y';
				}

				$length = iconv_strlen($token, 'UTF-8');
				return $this->_toComment(str_pad($this->date('Y', $this->getUnixTimestamp(), false), $length, '0', STR_PAD_LEFT));
				break;

			case 'Y' :
				if ((strlen($token) == 4) && (abs($this->getUnixTimestamp()) <= 0x7FFFFFFF)) {
					return 'o';
				}

				$length = iconv_strlen($token, 'UTF-8');
				return $this->_toComment(str_pad($this->date('o', $this->getUnixTimestamp(), false), $length, '0', STR_PAD_LEFT));
				break;

			case 'A' :
				$length  = iconv_strlen($token, 'UTF-8');
				$result  = $this->_fractional;
				$result += $this->date('s', $this->getUnixTimestamp(), false) * 1000;
				$result += $this->date('i', $this->getUnixTimestamp(), false) * 60000;
				$result += $this->date('H', $this->getUnixTimestamp(), false) * 3600000;

				return $this->_toComment(str_pad($result, $length, '0', STR_PAD_LEFT));
				break;
		}

		return $this->_toComment($token);
	}

	/**
	 * Private function to make a comment of a token
	 *
	 * @param string $token
	 * @return string
	 */
	private function _toComment($token)
	{
		$token = str_split($token);
		$result = '';
		foreach ($token as $tok) {
			$result .= '\\' . $tok;
		}

		return $result;
	}

	/**
	 * Return digit from standard names (english)
	 * Faster implementation than locale aware searching
	 *
	 * @param  string  $name
	 * @return integer  Number of this month
	 * @throws Zend_Date_Exception
	 */
	private function _getDigitFromName($name)
	{
		switch($name) {
			case "Jan":
				return 1;

			case "Feb":
				return 2;

			case "Mar":
				return 3;

			case "Apr":
				return 4;

			case "May":
				return 5;

			case "Jun":
				return 6;

			case "Jul":
				return 7;

			case "Aug":
				return 8;

			case "Sep":
				return 9;

			case "Oct":
				return 10;

			case "Nov":
				return 11;

			case "Dec":
				return 12;

			default:
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('Month ($name) is not a known month');
		}
	}

	/**
	 * Counts the exact year number
	 * < 70 - 2000 added, >70 < 100 - 1900, others just returned
	 *
	 * @param  integer  $value year number
	 * @return integer  Number of year
	 */
	public static function getFullYear($value)
	{
		if ($value >= 0) {
			if ($value < 70) {
				$value += 2000;
			} else if ($value < 100) {
				$value += 1900;
			}
		}
		return $value;
	}

	/**
	 * Sets the given date as new date or a given datepart as new datepart returning the new datepart
	 * This could be for example a localized dayname, the date without time,
	 * the month or only the seconds. There are about 50 different supported date parts.
	 * For a complete list of supported datepart values look into the docu
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date or datepart to set
	 * @param  string                          $part    OPTIONAL Part of the date to set, if null the timestamp is set
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer|string  new datepart
	 * @throws Zend_Date_Exception
	 */
	public function set($date, $part = null, $locale = null)
	{
		$zone = $this->getTimezoneFromString($date);
		$this->setTimezone($zone);

		$result = $this->_calculate('set', $date, $part, $locale);
		return $result;
	}

	/**
	 * Adds a date or datepart to the existing date, by extracting $part from $date,
	 * and modifying this object by adding that part.  The $part is then extracted from
	 * this object and returned as an integer or numeric string (for large values, or $part's
	 * corresponding to pre-defined formatted date strings).
	 * This could be for example a ISO 8601 date, the hour the monthname or only the minute.
	 * There are about 50 different supported date parts.
	 * For a complete list of supported datepart values look into the docu.
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date or datepart to add
	 * @param  string                          $part    OPTIONAL Part of the date to add, if null the timestamp is added
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer|string  new datepart
	 * @throws Zend_Date_Exception
	 */
	public function add($date, $part = null, $locale = null)
	{
		$this->_calculate('add', $date, $part, $locale);
		$result = $this->get($part, $locale);

		return $result;
	}

	/**
	 * Subtracts a date from another date.
	 * This could be for example a RFC2822 date, the time,
	 * the year or only the timestamp. There are about 50 different supported date parts.
	 * For a complete list of supported datepart values look into the docu
	 * Be aware: Adding -2 Months is not equal to Subtracting 2 Months !!!
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date or datepart to subtract
	 * @param  string                          $part    OPTIONAL Part of the date to sub, if null the timestamp is subtracted
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer|string  new datepart
	 * @throws Zend_Date_Exception
	 */
	public function sub($date, $part = null, $locale = null)
	{
		$this->_calculate('sub', $date, $part, $locale);
		$result = $this->get($part, $locale);

		return $result;
	}

	/**
	 * Compares a date or datepart with the existing one.
	 * Returns -1 if earlier, 0 if equal and 1 if later.
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date or datepart to compare with the date object
	 * @param  string                          $part    OPTIONAL Part of the date to compare, if null the timestamp is subtracted
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compare($date, $part = null, $locale = null)
	{
		$compare = $this->_calculate('cmp', $date, $part, $locale);

		if ($compare > 0) {
			return 1;
		} else if ($compare < 0) {
			return -1;
		}
		return 0;
	}

	/**
	 * Returns a new instance of Zend_Date with the selected part copied.
	 * To make an exact copy, use PHP's clone keyword.
	 * For a complete list of supported date part values look into the docu.
	 * If a date part is copied, all other date parts are set to standard values.
	 * For example: If only YEAR is copied, the returned date object is equal to
	 * 01-01-YEAR 00:00:00 (01-01-1970 00:00:00 is equal to timestamp 0)
	 * If only HOUR is copied, the returned date object is equal to
	 * 01-01-1970 HOUR:00:00 (so $this contains a timestamp equal to a timestamp of 0 plus HOUR).
	 *
	 * @param  string              $part    Part of the date to compare, if null the timestamp is subtracted
	 * @param  string|Zend_Locale  $locale  OPTIONAL New object's locale.  No adjustments to timezone are made.
	 * @return Zend_Date
	 */
	public function copyPart($part, $locale = null)
	{
		$clone = clone $this;           // copy all instance variables
		$clone->setUnixTimestamp(0);    // except the timestamp
		if ($locale != null) {
			$clone->setLocale($locale); // set an other locale if selected
		}
		$clone->set($this, $part);
		return $clone;
	}

	/**
	 * Internal function, returns the offset of a given timezone
	 *
	 * @param string $zone
	 * @return integer
	 */
	public function getTimezoneFromString($zone)
	{
		if (is_array($zone)) {
			return $this->getTimezone();
		}

		if ($zone instanceof Zend_Date) {
			return $zone->getTimezone();
		}

		$match = array();
		preg_match('/\dZ$/', $zone, $match);
		if (!empty($match)) {
			return "Etc/UTC";
		}

		preg_match('/([+-]\d{2}):{0,1}\d{2}/', $zone, $match);
		if (!empty($match) and ($match[count($match) - 1] <= 12) and ($match[count($match) - 1] >= -12)) {
			$zone = "Etc/GMT";
			$zone .= ($match[count($match) - 1] < 0) ? "+" : "-";
			$zone .= (int) abs($match[count($match) - 1]);
			return $zone;
		}

		preg_match('/([[:alpha:]\/]{3,30})(?!.*([[:alpha:]\/]{3,30}))/', $zone, $match);
		try {
			if (!empty($match) and (!is_int($match[count($match) - 1]))) {
				$oldzone = $this->getTimezone();
				$this->setTimezone($match[count($match) - 1]);
				$result = $this->getTimezone();
				$this->setTimezone($oldzone);
				if ($result !== $oldzone) {
					return $match[count($match) - 1];
				}
			}
		} catch (Exception $e) {
			// fall through
		}

		return $this->getTimezone();
	}

	/**
	 * Calculates the date or object
	 *
	 * @param  string                    $calc  Calculation to make
	 * @param  string|integer            $date  Date for calculation
	 * @param  string|integer            $comp  Second date for calculation
	 * @param  boolean|integer           $dst   Use dst correction if option is set
	 * @return integer|string|Zend_Date  new timestamp or Zend_Date depending on calculation
	 */
	private function _assign($calc, $date, $comp = 0, $dst = false)
	{
		switch ($calc) {
			case 'set' :
				if (!empty($comp)) {
					$this->setUnixTimestamp(call_user_func(Zend_Locale_Math::$sub, $this->getUnixTimestamp(), $comp));
				}
				$this->setUnixTimestamp(call_user_func(Zend_Locale_Math::$add, $this->getUnixTimestamp(), $date));
				$value = $this->getUnixTimestamp();
				break;
			case 'add' :
				$this->setUnixTimestamp(call_user_func(Zend_Locale_Math::$add, $this->getUnixTimestamp(), $date));
				$value = $this->getUnixTimestamp();
				break;
			case 'sub' :
				$this->setUnixTimestamp(call_user_func(Zend_Locale_Math::$sub, $this->getUnixTimestamp(), $date));
				$value = $this->getUnixTimestamp();
				break;
			default :
				// cmp - compare
				return call_user_func(Zend_Locale_Math::$comp, $comp, $date);
				break;
		}

		// dst-correction if 'fix_dst' = true and dst !== false but only for non UTC and non GMT
		if ((self::$_options['fix_dst'] === true) and ($dst !== false) and ($this->_dst === true)) {
			$hour = $this->get(self::HOUR);
			if ($hour != $dst) {
				if (($dst == ($hour + 1)) or ($dst == ($hour - 23))) {
					$value += 3600;
				} else if (($dst == ($hour - 1)) or ($dst == ($hour + 23))) {
					$value -= 3600;
				}
				$this->setUnixTimestamp($value);
			}
		}
		return $this->getUnixTimestamp();
	}


	/**
	 * Calculates the date or object
	 *
	 * @param  string                          $calc    Calculation to make, one of: 'add'|'sub'|'cmp'|'copy'|'set'
	 * @param  string|integer|array|Zend_Date  $date    Date or datepart to calculate with
	 * @param  string                          $part    Part of the date to calculate, if null the timestamp is used
	 * @param  string|Zend_Locale              $locale  Locale for parsing input
	 * @return integer|string|Zend_Date        new timestamp
	 * @throws Zend_Date_Exception
	 */
	private function _calculate($calc, $date, $part, $locale)
	{
		if ($date === null) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('parameter $date must be set, null is not allowed');
		}

		if (($part !== null) && (strlen($part) !== 2) && (Zend_Locale::isLocale($part, null, false))) {
			$locale = $part;
			$part   = null;
		}

		if ($locale === null) {
			$locale = $this->getLocale();
		}

		$locale = (string) $locale;

		// Create date parts
		$year   = $this->get(self::YEAR);
		$month  = $this->get(self::MONTH_SHORT);
		$day    = $this->get(self::DAY_SHORT);
		$hour   = $this->get(self::HOUR_SHORT);
		$minute = $this->get(self::MINUTE_SHORT);
		$second = $this->get(self::SECOND_SHORT);
		// If object extract value
		if ($date instanceof Zend_Date) {
			$date = $date->get($part, $locale);
		}

		if (is_array($date) === true) {
			if (empty($part) === false) {
				switch($part) {
					// Fall through
					case self::DAY:
					case self::DAY_SHORT:
						if (isset($date['day']) === true) {
							$date = $date['day'];
						}
						break;
						// Fall through
					case self::WEEKDAY_SHORT:
					case self::WEEKDAY:
					case self::WEEKDAY_8601:
					case self::WEEKDAY_DIGIT:
					case self::WEEKDAY_NARROW:
					case self::WEEKDAY_NAME:
						if (isset($date['weekday']) === true) {
							$date = $date['weekday'];
							$part = self::WEEKDAY_DIGIT;
						}
						break;
					case self::DAY_OF_YEAR:
						if (isset($date['day_of_year']) === true) {
							$date = $date['day_of_year'];
						}
						break;
						// Fall through
					case self::MONTH:
					case self::MONTH_SHORT:
					case self::MONTH_NAME:
					case self::MONTH_NAME_SHORT:
					case self::MONTH_NAME_NARROW:
						if (isset($date['month']) === true) {
							$date = $date['month'];
						}
						break;
						// Fall through
					case self::YEAR:
					case self::YEAR_SHORT:
					case self::YEAR_8601:
					case self::YEAR_SHORT_8601:
						if (isset($date['year']) === true) {
							$date = $date['year'];
						}
						break;
						// Fall through
					case self::HOUR:
					case self::HOUR_AM:
					case self::HOUR_SHORT:
					case self::HOUR_SHORT_AM:
						if (isset($date['hour']) === true) {
							$date = $date['hour'];
						}
						break;
						// Fall through
					case self::MINUTE:
					case self::MINUTE_SHORT:
						if (isset($date['minute']) === true) {
							$date = $date['minute'];
						}
						break;
						// Fall through
					case self::SECOND:
					case self::SECOND_SHORT:
						if (isset($date['second']) === true) {
							$date = $date['second'];
						}
						break;
						// Fall through
					case self::TIMEZONE:
					case self::TIMEZONE_NAME:
						if (isset($date['timezone']) === true) {
							$date = $date['timezone'];
						}
						break;
					case self::TIMESTAMP:
						if (isset($date['timestamp']) === true) {
							$date = $date['timestamp'];
						}
						break;
					case self::WEEK:
						if (isset($date['week']) === true) {
							$date = $date['week'];
						}
						break;
					case self::TIMEZONE_SECS:
						if (isset($date['gmtsecs']) === true) {
							$date = $date['gmtsecs'];
						}
						break;
					default:
						require_once 'Zend/Date/Exception.php';
						throw new Zend_Date_Exception("datepart for part ($part) not found in array");
						break;
				}
			} else {
				$hours = 0;
				if (isset($date['hour']) === true) {
					$hours = $date['hour'];
				}
				$minutes = 0;
				if (isset($date['minute']) === true) {
					$minutes = $date['minute'];
				}
				$seconds = 0;
				if (isset($date['second']) === true) {
					$seconds = $date['second'];
				}
				$months = 0;
				if (isset($date['month']) === true) {
					$months = $date['month'];
				}
				$days = 0;
				if (isset($date['day']) === true) {
					$days = $date['day'];
				}
				$years = 0;
				if (isset($date['year']) === true) {
					$years = $date['year'];
				}
				return $this->_assign($calc, $this->mktime($hours, $minutes, $seconds, $months, $days, $years, true),
				$this->mktime($hour, $minute, $second, $month, $day, $year, true), $hour);
			}
		}

		// $date as object, part of foreign date as own date
		switch($part) {

			// day formats
			case self::DAY:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + intval($date), 1970, true),
					$this->mktime(0, 0, 0, 1, 1 + intval($day), 1970, true), $hour);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, day expected", $date);
				break;

			case self::WEEKDAY_SHORT:
				$daylist = Zend_Locale_Data::getList($locale, 'day');
				$weekday = (int) $this->get(self::WEEKDAY_DIGIT, $locale);
				$cnt = 0;

				foreach ($daylist as $key => $value) {
					if (strtoupper(iconv_substr($value, 0, 3, 'UTF-8')) == strtoupper($date)) {
						$found = $cnt;
						break;
					}
					++$cnt;
				}

				// Weekday found
				if ($cnt < 7) {
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $found, 1970, true),
					$this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
				}

				// Weekday not found
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", $date);
				break;

			case self::DAY_SHORT:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + intval($date), 1970, true),
					$this->mktime(0, 0, 0, 1, 1 + intval($day), 1970, true), $hour);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, day expected", $date);
				break;

			case self::WEEKDAY:
				$daylist = Zend_Locale_Data::getList($locale, 'day');
				$weekday = (int) $this->get(self::WEEKDAY_DIGIT, $locale);
				$cnt = 0;

				foreach ($daylist as $key => $value) {
					if (strtoupper($value) == strtoupper($date)) {
						$found = $cnt;
						break;
					}
					++$cnt;
				}

				// Weekday found
				if ($cnt < 7) {
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $found, 1970, true),
					$this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
				}

				// Weekday not found
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", $date);
				break;

			case self::WEEKDAY_8601:
				$weekday = (int) $this->get(self::WEEKDAY_8601, $locale);
				if ((intval($date) > 0) and (intval($date) < 8)) {
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + intval($date), 1970, true),
					$this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
				}

				// Weekday not found
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", $date);
				break;

			case self::DAY_SUFFIX:
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('day suffix not supported', $date);
				break;

			case self::WEEKDAY_DIGIT:
				$weekday = (int) $this->get(self::WEEKDAY_DIGIT, $locale);
				if (is_numeric($date) and (intval($date) >= 0) and (intval($date) < 7)) {
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $date, 1970, true),
					$this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
				}

				// Weekday not found
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", $date);
				break;

			case self::DAY_OF_YEAR:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $date, 1970, true),
					$this->mktime(0, 0, 0, $month, 1 + $day, 1970, true), $hour);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, day expected", $date);
				break;

			case self::WEEKDAY_NARROW:
				$daylist = Zend_Locale_Data::getList($locale, 'day', array('gregorian', 'format', 'abbreviated'));
				$weekday = (int) $this->get(self::WEEKDAY_DIGIT, $locale);
				$cnt = 0;
				foreach ($daylist as $key => $value) {
					if (strtoupper(iconv_substr($value, 0, 1, 'UTF-8')) == strtoupper($date)) {
						$found = $cnt;
						break;
					}
					++$cnt;
				}

				// Weekday found
				if ($cnt < 7) {
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $found, 1970, true),
					$this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
				}

				// Weekday not found
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", $date);
				break;

			case self::WEEKDAY_NAME:
				$daylist = Zend_Locale_Data::getList($locale, 'day', array('gregorian', 'format', 'abbreviated'));
				$weekday = (int) $this->get(self::WEEKDAY_DIGIT, $locale);
				$cnt = 0;
				foreach ($daylist as $key => $value) {
					if (strtoupper($value) == strtoupper($date)) {
						$found = $cnt;
						break;
					}
					++$cnt;
				}

				// Weekday found
				if ($cnt < 7) {
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1, 1 + $found, 1970, true),
					$this->mktime(0, 0, 0, 1, 1 + $weekday, 1970, true), $hour);
				}

				// Weekday not found
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, weekday expected", $date);
				break;

				// week formats
			case self::WEEK:
				if (is_numeric($date)) {
					$week = (int) $this->get(self::WEEK, $locale);
					return $this->_assign($calc, parent::mktime(0, 0, 0, 1, 1 + ($date * 7), 1970, true),
					parent::mktime(0, 0, 0, 1, 1 + ($week * 7), 1970, true), $hour);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, week expected", $date);
				break;

				// month formats
			case self::MONTH_NAME:
				$monthlist = Zend_Locale_Data::getList($locale, 'month');
				$cnt = 0;
				foreach ($monthlist as $key => $value) {
					if (strtoupper($value) == strtoupper($date)) {
						$found = $key;
						break;
					}
					++$cnt;
				}
				$date = array_search($date, $monthlist);

				// Monthname found
				if ($cnt < 12) {
					$fixday = 0;
					if ($calc == 'add') {
						$date += $found;
						$calc = 'set';
						if (self::$_options['extend_month'] == false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					} else if ($calc == 'sub') {
						$date = $month - $found;
						$calc = 'set';
						if (self::$_options['extend_month'] == false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, $date,  $day + $fixday, $year, true),
					$this->mktime(0, 0, 0, $month, $day, $year, true), $hour);
				}

				// Monthname not found
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, month expected", $date);
				break;

			case self::MONTH:
				if (is_numeric($date)) {
					$fixday = 0;
					if ($calc == 'add') {
						$date += $month;
						$calc = 'set';
						if (self::$_options['extend_month'] == false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					} else if ($calc == 'sub') {
						$date = $month - $date;
						$calc = 'set';
						if (self::$_options['extend_month'] == false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, $date, $day + $fixday, $year, true),
					$this->mktime(0, 0, 0, $month, $day, $year, true), $hour);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, month expected", $date);
				break;

			case self::MONTH_NAME_SHORT:
				$monthlist = Zend_Locale_Data::getList($locale, 'month', array('gregorian', 'format', 'abbreviated'));
				$cnt = 0;
				foreach ($monthlist as $key => $value) {
					if (strtoupper($value) == strtoupper($date)) {
						$found = $key;
						break;
					}
					++$cnt;
				}
				$date = array_search($date, $monthlist);

				// Monthname found
				if ($cnt < 12) {
					$fixday = 0;
					if ($calc == 'add') {
						$date += $found;
						$calc = 'set';
						if (self::$_options['extend_month'] === false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					} else if ($calc == 'sub') {
						$date = $month - $found;
						$calc = 'set';
						if (self::$_options['extend_month'] === false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, $date, $day + $fixday, $year, true),
					$this->mktime(0, 0, 0, $month, $day, $year, true), $hour);
				}

				// Monthname not found
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, month expected", $date);
				break;

			case self::MONTH_SHORT:
				if (is_numeric($date) === true) {
					$fixday = 0;
					if ($calc === 'add') {
						$date += $month;
						$calc  = 'set';
						if (self::$_options['extend_month'] === false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					} else if ($calc === 'sub') {
						$date = $month - $date;
						$calc = 'set';
						if (self::$_options['extend_month'] === false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					}

					return $this->_assign($calc, $this->mktime(0, 0, 0, $date,  $day + $fixday, $year, true),
					$this->mktime(0, 0, 0, $month, $day,           $year, true), $hour);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, month expected", $date);
				break;

			case self::MONTH_DAYS:
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('month days not supported', $date);
				break;

			case self::MONTH_NAME_NARROW:
				$monthlist = Zend_Locale_Data::getList($locale, 'month', array('gregorian', 'stand-alone', 'narrow'));
				$cnt       = 0;
				foreach ($monthlist as $key => $value) {
					if (strtoupper($value) === strtoupper($date)) {
						$found = $key;
						break;
					}
					++$cnt;
				}
				$date = array_search($date, $monthlist);

				// Monthname found
				if ($cnt < 12) {
					$fixday = 0;
					if ($calc === 'add') {
						$date += $found;
						$calc  = 'set';
						if (self::$_options['extend_month'] === false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					} else if ($calc === 'sub') {
						$date = $month - $found;
						$calc = 'set';
						if (self::$_options['extend_month'] === false) {
							$parts = $this->getDateParts($this->mktime($hour, $minute, $second, $date, $day, $year, false));
							if ($parts['mday'] != $day) {
								$fixday = ($parts['mday'] < $day) ? -$parts['mday'] : ($parts['mday'] - $day);
							}
						}
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, $date,  $day + $fixday, $year, true),
					$this->mktime(0, 0, 0, $month, $day,           $year, true), $hour);
				}

				// Monthname not found
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, month expected", $date);
				break;

				// year formats
			case self::LEAPYEAR:
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('leap year not supported', $date);
				break;

			case self::YEAR_8601:
				if (is_numeric($date)) {
					if ($calc === 'add') {
						$date += $year;
						$calc  = 'set';
					} else if ($calc === 'sub') {
						$date = $year - $date;
						$calc = 'set';
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, $month, $day, intval($date), true),
					$this->mktime(0, 0, 0, $month, $day, $year,         true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, year expected", $date);
				break;

			case self::YEAR:
				if (is_numeric($date)) {
					if ($calc === 'add') {
						$date += $year;
						$calc  = 'set';
					} else if ($calc === 'sub') {
						$date = $year - $date;
						$calc = 'set';
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, $month, $day, intval($date), true),
					$this->mktime(0, 0, 0, $month, $day, $year,         true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, year expected", $date);
				break;

			case self::YEAR_SHORT:
				if (is_numeric($date)) {
					$date = intval($date);
					if (($calc == 'set') || ($calc == 'cmp')) {
						$date = self::getFullYear($date);
					}
					if ($calc === 'add') {
						$date += $year;
						$calc  = 'set';
					} else if ($calc === 'sub') {
						$date = $year - $date;
						$calc = 'set';
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, $month, $day, $date, true),
					$this->mktime(0, 0, 0, $month, $day, $year, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, year expected", $date);
				break;

			case self::YEAR_SHORT_8601:
				if (is_numeric($date)) {
					$date = intval($date);
					if (($calc === 'set') || ($calc === 'cmp')) {
						$date = self::getFullYear($date);
					}
					if ($calc === 'add') {
						$date += $year;
						$calc  = 'set';
					} else if ($calc === 'sub') {
						$date = $year - $date;
						$calc = 'set';
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, $month, $day, $date, true),
					$this->mktime(0, 0, 0, $month, $day, $year, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, year expected", $date);
				break;

				// time formats
			case self::MERIDIEM:
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('meridiem not supported', $date);
				break;

			case self::SWATCH:
				if (is_numeric($date)) {
					$rest    = intval($date);
					$hours   = floor($rest * 24 / 1000);
					$rest    = $rest - ($hours * 1000 / 24);
					$minutes = floor($rest * 1440 / 1000);
					$rest    = $rest - ($minutes * 1000 / 1440);
					$seconds = floor($rest * 86400 / 1000);
					return $this->_assign($calc, $this->mktime($hours, $minutes, $seconds, 1, 1, 1970, true),
					$this->mktime($hour,  $minute,  $second,  1, 1, 1970, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, swatchstamp expected", $date);
				break;

			case self::HOUR_SHORT_AM:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(intval($date), 0, 0, 1, 1, 1970, true),
					$this->mktime($hour,         0, 0, 1, 1, 1970, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, hour expected", $date);
				break;

			case self::HOUR_SHORT:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(intval($date), 0, 0, 1, 1, 1970, true),
					$this->mktime($hour,         0, 0, 1, 1, 1970, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, hour expected", $date);
				break;

			case self::HOUR_AM:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(intval($date), 0, 0, 1, 1, 1970, true),
					$this->mktime($hour,         0, 0, 1, 1, 1970, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, hour expected", $date);
				break;

			case self::HOUR:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(intval($date), 0, 0, 1, 1, 1970, true),
					$this->mktime($hour,         0, 0, 1, 1, 1970, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, hour expected", $date);
				break;

			case self::MINUTE:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(0, intval($date), 0, 1, 1, 1970, true),
					$this->mktime(0, $minute,       0, 1, 1, 1970, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, minute expected", $date);
				break;

			case self::SECOND:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(0, 0, intval($date), 1, 1, 1970, true),
					$this->mktime(0, 0, $second,       1, 1, 1970, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, second expected", $date);
				break;

			case self::MILLISECOND:
				if (is_numeric($date)) {
					switch($calc) {
						case 'set' :
							return $this->setMillisecond($date);
							break;
						case 'add' :
							return $this->addMillisecond($date);
							break;
						case 'sub' :
							return $this->subMillisecond($date);
							break;
					}
					return $this->compareMillisecond($date);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, milliseconds expected", $date);
				break;

			case self::MINUTE_SHORT:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(0, intval($date), 0, 1, 1, 1970, true),
					$this->mktime(0, $minute,       0, 1, 1, 1970, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, minute expected", $date);
				break;

			case self::SECOND_SHORT:
				if (is_numeric($date)) {
					return $this->_assign($calc, $this->mktime(0, 0, intval($date), 1, 1, 1970, true),
					$this->mktime(0, 0, $second,       1, 1, 1970, true), false);
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, second expected", $date);
				break;

				// timezone formats
				// break intentionally omitted
			case self::TIMEZONE_NAME:
			case self::TIMEZONE:
			case self::TIMEZONE_SECS:
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('timezone not supported', $date);
				break;

			case self::DAYLIGHT:
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('daylight not supported', $date);
				break;

			case self::GMT_DIFF:
			case self::GMT_DIFF_SEP:
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('gmtdiff not supported', $date);
				break;

				// date strings
			case self::ISO_8601:
				// (-)YYYY-MM-dd
				preg_match('/^(-{0,1}\d{4})-(\d{2})-(\d{2})/', $date, $datematch);
				// (-)YY-MM-dd
				if (empty($datematch)) {
					preg_match('/^(-{0,1}\d{2})-(\d{2})-(\d{2})/', $date, $datematch);
				}
				// (-)YYYYMMdd
				if (empty($datematch)) {
					preg_match('/^(-{0,1}\d{4})(\d{2})(\d{2})/', $date, $datematch);
				}
				// (-)YYMMdd
				if (empty($datematch)) {
					preg_match('/^(-{0,1}\d{2})(\d{2})(\d{2})/', $date, $datematch);
				}
				$tmpdate = $date;
				if (!empty($datematch)) {
					$dateMatchCharCount = iconv_strlen($datematch[0], 'UTF-8');
					$tmpdate = iconv_substr($date,
					$dateMatchCharCount,
					iconv_strlen($date, 'UTF-8') - $dateMatchCharCount,
                                            'UTF-8');
				}
				// (T)hh:mm:ss
				preg_match('/[T,\s]{0,1}(\d{2}):(\d{2}):(\d{2})/', $tmpdate, $timematch);
				if (empty($timematch)) {
					preg_match('/[T,\s]{0,1}(\d{2})(\d{2})(\d{2})/', $tmpdate, $timematch);
				}
				if (empty($datematch) and empty($timematch)) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("unsupported ISO8601 format ($date)", $date);
				}
				if (!empty($timematch)) {
					$timeMatchCharCount = iconv_strlen($timematch[0], 'UTF-8');
					$tmpdate = iconv_substr($tmpdate,
					$timeMatchCharCount,
					iconv_strlen($tmpdate, 'UTF-8') - $timeMatchCharCount,
                                            'UTF-8');
				}
				if (empty($datematch)) {
					$datematch[1] = 1970;
					$datematch[2] = 1;
					$datematch[3] = 1;
				} else if (iconv_strlen($datematch[1], 'UTF-8') == 2) {
					$datematch[1] = self::getFullYear($datematch[1]);
				}
				if (empty($timematch)) {
					$timematch[1] = 0;
					$timematch[2] = 0;
					$timematch[3] = 0;
				}

				if (($calc == 'set') || ($calc == 'cmp')) {
					--$datematch[2];
					--$month;
					--$datematch[3];
					--$day;
					$datematch[1] -= 1970;
					$year         -= 1970;
				}
				return $this->_assign($calc, $this->mktime($timematch[1], $timematch[2], $timematch[3], 1 + $datematch[2], 1 + $datematch[3], 1970 + $datematch[1], false),
				$this->mktime($hour,         $minute,       $second,       1 + $month,        1 + $day,          1970 + $year,         false), false);
				break;

			case self::RFC_2822:
				$result = preg_match('/^\w{3},\s(\d{1,2})\s(\w{3})\s(\d{4})\s(\d{2}):(\d{2}):{0,1}(\d{0,2})\s([+-]{1}\d{4})$/', $date, $match);
				if (!$result) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("no RFC 2822 format ($date)", $date);
				}

				$months  = $this->_getDigitFromName($match[2]);

				if (($calc == 'set') || ($calc == 'cmp')) {
					--$months;
					--$month;
					--$match[1];
					--$day;
					$match[3] -= 1970;
					$year     -= 1970;
				}
				return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], false),
				$this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     false), false);
				break;

			case self::TIMESTAMP:
				if (is_numeric($date)) {
					return $this->_assign($calc, $date, $this->getUnixTimestamp());
				}
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("invalid date ($date) operand, timestamp expected", $date);
				break;

				// additional formats
				// break intentionally omitted
			case self::ERA:
			case self::ERA_NAME:
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception('era not supported', $date);
				break;

			case self::DATES:
				try {
					$parsed = Zend_Locale_Format::getDate($date, array('locale' => $locale, 'format_type' => 'iso', 'fix_date' => true));

					if (($calc == 'set') || ($calc == 'cmp')) {
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::DATE_FULL:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'full'));
					$parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

					if (($calc == 'set') || ($calc == 'cmp')) {
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::DATE_LONG:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'long'));
					$parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

					if (($calc == 'set') || ($calc == 'cmp')){
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::DATE_MEDIUM:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'medium'));
					$parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

					if (($calc == 'set') || ($calc == 'cmp')) {
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::DATE_SHORT:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'short'));
					$parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

					$parsed['year'] = self::getFullYear($parsed['year']);

					if (($calc == 'set') || ($calc == 'cmp')) {
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}
					return $this->_assign($calc, $this->mktime(0, 0, 0, 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime(0, 0, 0, 1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::TIMES:
				try {
					if ($calc != 'set') {
						$month = 1;
						$day   = 1;
						$year  = 1970;
					}
					$parsed = Zend_Locale_Format::getTime($date, array('locale' => $locale, 'format_type' => 'iso', 'fix_date' => true));
					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
					$this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::TIME_FULL:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'full'));
					$parsed = Zend_Locale_Format::getTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
					if ($calc != 'set') {
						$month = 1;
						$day   = 1;
						$year  = 1970;
					}

					if (!isset($parsed['second'])) {
						$parsed['second'] = 0;
					}

					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
					$this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::TIME_LONG:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'long'));
					$parsed = Zend_Locale_Format::getTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
					if ($calc != 'set') {
						$month = 1;
						$day   = 1;
						$year  = 1970;
					}
					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
					$this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::TIME_MEDIUM:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'medium'));
					$parsed = Zend_Locale_Format::getTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
					if ($calc != 'set') {
						$month = 1;
						$day   = 1;
						$year  = 1970;
					}
					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
					$this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::TIME_SHORT:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'short'));
					$parsed = Zend_Locale_Format::getTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
					if ($calc != 'set') {
						$month = 1;
						$day   = 1;
						$year  = 1970;
					}

					if (!isset($parsed['second'])) {
						$parsed['second'] = 0;
					}

					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], $month, $day, $year, true),
					$this->mktime($hour,           $minute,           $second,           $month, $day, $year, true), false);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::DATETIME:
				try {
					$parsed = Zend_Locale_Format::getDateTime($date, array('locale' => $locale, 'format_type' => 'iso', 'fix_date' => true));
					if (($calc == 'set') || ($calc == 'cmp')) {
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}
					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::DATETIME_FULL:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'full'));
					$parsed = Zend_Locale_Format::getDateTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

					if (($calc == 'set') || ($calc == 'cmp')) {
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}

					if (!isset($parsed['second'])) {
						$parsed['second'] = 0;
					}

					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::DATETIME_LONG:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'long'));
					$parsed = Zend_Locale_Format::getDateTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

					if (($calc == 'set') || ($calc == 'cmp')){
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}
					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::DATETIME_MEDIUM:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'medium'));
					$parsed = Zend_Locale_Format::getDateTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));
					if (($calc == 'set') || ($calc == 'cmp')) {
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}
					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

			case self::DATETIME_SHORT:
				try {
					$format = Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'short'));
					$parsed = Zend_Locale_Format::getDateTime($date, array('date_format' => $format, 'format_type' => 'iso', 'locale' => $locale));

					$parsed['year'] = self::getFullYear($parsed['year']);

					if (($calc == 'set') || ($calc == 'cmp')) {
						--$parsed['month'];
						--$month;
						--$parsed['day'];
						--$day;
						$parsed['year'] -= 1970;
						$year  -= 1970;
					}

					if (!isset($parsed['second'])) {
						$parsed['second'] = 0;
					}

					return $this->_assign($calc, $this->mktime($parsed['hour'], $parsed['minute'], $parsed['second'], 1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'], true),
					$this->mktime($hour,           $minute,           $second,           1 + $month,           1 + $day,           1970 + $year,           true), $hour);
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage(), $date);
				}
				break;

				// ATOM and RFC_3339 are identical
			case self::ATOM:
			case self::RFC_3339:
				$result = preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})\d{0,4}([+-]{1}\d{2}:\d{2}|Z)$/', $date, $match);
				if (!$result) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("invalid date ($date) operand, ATOM format expected", $date);
				}

				if (($calc == 'set') || ($calc == 'cmp')) {
					--$match[2];
					--$month;
					--$match[3];
					--$day;
					$match[1] -= 1970;
					$year     -= 1970;
				}
				return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $match[2], 1 + $match[3], 1970 + $match[1], true),
				$this->mktime($hour,     $minute,   $second,   1 + $month,    1 + $day,      1970 + $year,     true), false);
				break;

			case self::COOKIE:
				$result = preg_match("/^\w{6,9},\s(\d{2})-(\w{3})-(\d{2})\s(\d{2}):(\d{2}):(\d{2})\s.{3,20}$/", $date, $match);
				if (!$result) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("invalid date ($date) operand, COOKIE format expected", $date);
				}
				$matchStartPos = iconv_strpos($match[0], ' ', 0, 'UTF-8') + 1;
				$match[0] = iconv_substr($match[0],
				$matchStartPos,
				iconv_strlen($match[0], 'UTF-8') - $matchStartPos,
                                         'UTF-8');

				$months    = $this->_getDigitFromName($match[2]);
				$match[3] = self::getFullYear($match[3]);

				if (($calc == 'set') || ($calc == 'cmp')) {
					--$months;
					--$month;
					--$match[1];
					--$day;
					$match[3] -= 1970;
					$year     -= 1970;
				}
				return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], true),
				$this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     true), false);
				break;

			case self::RFC_822:
			case self::RFC_1036:
				// new RFC 822 format, identical to RFC 1036 standard
				$result = preg_match('/^\w{0,3},{0,1}\s{0,1}(\d{1,2})\s(\w{3})\s(\d{2})\s(\d{2}):(\d{2}):{0,1}(\d{0,2})\s([+-]{1}\d{4}|\w{1,20})$/', $date, $match);
				if (!$result) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("invalid date ($date) operand, RFC 822 date format expected", $date);
				}

				$months    = $this->_getDigitFromName($match[2]);
				$match[3] = self::getFullYear($match[3]);

				if (($calc == 'set') || ($calc == 'cmp')) {
					--$months;
					--$month;
					--$match[1];
					--$day;
					$match[3] -= 1970;
					$year     -= 1970;
				}
				return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], false),
				$this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     false), false);
				break;

			case self::RFC_850:
				$result = preg_match('/^\w{6,9},\s(\d{2})-(\w{3})-(\d{2})\s(\d{2}):(\d{2}):(\d{2})\s.{3,21}$/', $date, $match);
				if (!$result) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("invalid date ($date) operand, RFC 850 date format expected", $date);
				}

				$months    = $this->_getDigitFromName($match[2]);
				$match[3] = self::getFullYear($match[3]);

				if (($calc == 'set') || ($calc == 'cmp')) {
					--$months;
					--$month;
					--$match[1];
					--$day;
					$match[3] -= 1970;
					$year     -= 1970;
				}
				return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], true),
				$this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     true), false);
				break;

			case self::RFC_1123:
				$result = preg_match('/^\w{0,3},{0,1}\s{0,1}(\d{1,2})\s(\w{3})\s(\d{2,4})\s(\d{2}):(\d{2}):{0,1}(\d{0,2})\s([+-]{1}\d{4}|\w{1,20})$/', $date, $match);
				if (!$result) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("invalid date ($date) operand, RFC 1123 date format expected", $date);
				}

				$months  = $this->_getDigitFromName($match[2]);

				if (($calc == 'set') || ($calc == 'cmp')) {
					--$months;
					--$month;
					--$match[1];
					--$day;
					$match[3] -= 1970;
					$year     -= 1970;
				}
				return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], true),
				$this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     true), false);
				break;

			case self::RSS:
				$result = preg_match('/^\w{3},\s(\d{2})\s(\w{3})\s(\d{2,4})\s(\d{1,2}):(\d{2}):(\d{2})\s.{1,21}$/', $date, $match);
				if (!$result) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("invalid date ($date) operand, RSS date format expected", $date);
				}

				$months  = $this->_getDigitFromName($match[2]);
				$match[3] = self::getFullYear($match[3]);

				if (($calc == 'set') || ($calc == 'cmp')) {
					--$months;
					--$month;
					--$match[1];
					--$day;
					$match[3] -= 1970;
					$year  -= 1970;
				}
				return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $months, 1 + $match[1], 1970 + $match[3], true),
				$this->mktime($hour,     $minute,   $second,   1 + $month,  1 + $day,      1970 + $year,     true), false);
				break;

			case self::W3C:
				$result = preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})[+-]{1}\d{2}:\d{2}$/', $date, $match);
				if (!$result) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("invalid date ($date) operand, W3C date format expected", $date);
				}

				if (($calc == 'set') || ($calc == 'cmp')) {
					--$match[2];
					--$month;
					--$match[3];
					--$day;
					$match[1] -= 1970;
					$year     -= 1970;
				}
				return $this->_assign($calc, $this->mktime($match[4], $match[5], $match[6], 1 + $match[2], 1 + $match[3], 1970 + $match[1], true),
				$this->mktime($hour,     $minute,   $second,   1 + $month,    1 + $day,      1970 + $year,     true), false);
				break;

			default:
				if (!is_numeric($date) || !empty($part)) {
					try {
						if (self::$_options['format_type'] == 'php') {
							$part = Zend_Locale_Format::convertPhpToIsoFormat($part);
						}
						if (empty($part)) {
							$part  = Zend_Locale_Format::getDateFormat($locale) . " ";
							$part .= Zend_Locale_Format::getTimeFormat($locale);
						}
						$parsed = Zend_Locale_Format::getDate($date, array('date_format' => $part, 'locale' => $locale, 'fix_date' => true, 'format_type' => 'iso'));
						if ((strpos(strtoupper($part), 'YY') !== false) and (strpos(strtoupper($part), 'YYYY') === false)) {
							$parsed['year'] = self::getFullYear($parsed['year']);
						}
						if (($calc == 'set') || ($calc == 'cmp')) {
							if (isset($parsed['month'])) {
								--$parsed['month'];
							} else {
								$parsed['month'] = 0;
							}
							if (isset($parsed['day'])) {
								--$parsed['day'];
							} else {
								$parsed['day'] = 0;
							}
							if (isset($parsed['year'])) {
								$parsed['year'] -= 1970;
							} else {
								$parsed['year'] = 0;
							}
						}
						return $this->_assign($calc, $this->mktime(
						isset($parsed['hour']) ? $parsed['hour'] : 0,
						isset($parsed['minute']) ? $parsed['minute'] : 0,
						isset($parsed['second']) ? $parsed['second'] : 0,
						1 + $parsed['month'], 1 + $parsed['day'], 1970 + $parsed['year'],
						false), $this->getUnixTimestamp(), false);
					} catch (Zend_Locale_Exception $e) {
						if (!is_numeric($date)) {
							require_once 'Zend/Date/Exception.php';
							throw new Zend_Date_Exception($e->getMessage(), $date);
						}
					}
				}
				return $this->_assign($calc, $date, $this->getUnixTimestamp(), false);
				break;
		}
	}

	/**
	 * Returns true when both date objects or date parts are equal.
	 * For example:
	 * 15.May.2000 <-> 15.June.2000 Equals only for Day or Year... all other will return false
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date or datepart to equal with
	 * @param  string                          $part    OPTIONAL Part of the date to compare, if null the timestamp is used
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return boolean
	 * @throws Zend_Date_Exception
	 */
	public function equals($date, $part = null, $locale = null)
	{
		$result = $this->compare($date, $part, $locale);

		if ($result == 0) {
			return true;
		}
		return false;
	}

	/**
	 * Returns if the given date or datepart is earlier
	 * For example:
	 * 15.May.2000 <-> 13.June.1999 will return true for day, year and date, but not for month
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date or datepart to compare with
	 * @param  string                          $part    OPTIONAL Part of the date to compare, if null the timestamp is used
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return boolean
	 * @throws Zend_Date_Exception
	 */
	public function isEarlier($date, $part = null, $locale = null)
	{
		$result = $this->compare($date, $part, $locale);

		if ($result == -1) {
			return true;
		}
		return false;
	}

	/**
	 * Returns if the given date or datepart is later
	 * For example:
	 * 15.May.2000 <-> 13.June.1999 will return true for month but false for day, year and date
	 * Returns if the given date is later
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date or datepart to compare with
	 * @param  string                          $part    OPTIONAL Part of the date to compare, if null the timestamp is used
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return boolean
	 * @throws Zend_Date_Exception
	 */
	public function isLater($date, $part = null, $locale = null)
	{
		$result = $this->compare($date, $part, $locale);

		if ($result == 1) {
			return true;
		}
		return false;
	}

	/**
	 * Returns only the time of the date as new Zend_Date object
	 * For example:
	 * 15.May.2000 10:11:23 will return a dateobject equal to 01.Jan.1970 10:11:23
	 *
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getTime($locale = null)
	{
		return $this->copyPart(self::TIME_MEDIUM, $locale);
	}

	/**
	 * Returns the calculated time
	 *
	 * @param  string                    $calc    Calculation to make
	 * @param  string|integer|array|Zend_Date  $time    Time to calculate with, if null the actual time is taken
	 * @param  string                          $format  Timeformat for parsing input
	 * @param  string|Zend_Locale              $locale  Locale for parsing input
	 * @return integer|Zend_Date  new time
	 * @throws Zend_Date_Exception
	 */
	private function _time($calc, $time, $format, $locale)
	{
		if ($time === null) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('parameter $time must be set, null is not allowed');
		}

		if ($time instanceof Zend_Date) {
			// extract time from object
			$time = $time->get('HH:mm:ss');
		} else {
			if (is_array($time)) {
				if ((isset($time['hour']) === true) or (isset($time['minute']) === true) or
				(isset($time['second']) === true)) {
					$parsed = $time;
				} else {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("no hour, minute or second given in array");
				}
			} else {
				if (self::$_options['format_type'] == 'php') {
					$format = Zend_Locale_Format::convertPhpToIsoFormat($format);
				}
				try {
					if ($locale === null) {
						$locale = $this->getLocale();
					}

					$parsed = Zend_Locale_Format::getTime($time, array('date_format' => $format, 'locale' => $locale, 'format_type' => 'iso'));
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage());
				}
			}
			$time  = str_pad($parsed['hour'], 2, '0', STR_PAD_LEFT) . ":";
			$time .= str_pad($parsed['minute'], 2, '0', STR_PAD_LEFT) . ":";
			$time .= str_pad($parsed['second'], 2, '0', STR_PAD_LEFT);
		}

		$return = $this->_calcdetail($calc, $time, self::TIMES, 'de');
		if ($calc != 'cmp') {
			return $this;
		}
		return $return;
	}


	/**
	 * Sets a new time for the date object. Format defines how to parse the time string.
	 * Also a complete date can be given, but only the time is used for setting.
	 * For example: dd.MMMM.yyTHH:mm' and 'ss sec'-> 10.May.07T25:11 and 44 sec => 1h11min44sec + 1 day
	 * Returned is the new date object and the existing date is left as it was before
	 *
	 * @param  string|integer|array|Zend_Date  $time    Time to set
	 * @param  string                          $format  OPTIONAL Timeformat for parsing input
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new time
	 * @throws Zend_Date_Exception
	 */
	public function setTime($time, $format = null, $locale = null)
	{
		return $this->_time('set', $time, $format, $locale);
	}


	/**
	 * Adds a time to the existing date. Format defines how to parse the time string.
	 * If only parts are given the other parts are set to 0.
	 * If no format is given, the standardformat of this locale is used.
	 * For example: HH:mm:ss -> 10 -> +10 hours
	 *
	 * @param  string|integer|array|Zend_Date  $time    Time to add
	 * @param  string                          $format  OPTIONAL Timeformat for parsing input
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new time
	 * @throws Zend_Date_Exception
	 */
	public function addTime($time, $format = null, $locale = null)
	{
		return $this->_time('add', $time, $format, $locale);
	}


	/**
	 * Subtracts a time from the existing date. Format defines how to parse the time string.
	 * If only parts are given the other parts are set to 0.
	 * If no format is given, the standardformat of this locale is used.
	 * For example: HH:mm:ss -> 10 -> -10 hours
	 *
	 * @param  string|integer|array|Zend_Date  $time    Time to sub
	 * @param  string                          $format  OPTIONAL Timeformat for parsing input
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new time
	 * @throws Zend_Date_Exception
	 */
	public function subTime($time, $format = null, $locale = null)
	{
		return $this->_time('sub', $time, $format, $locale);
	}


	/**
	 * Compares the time from the existing date. Format defines how to parse the time string.
	 * If only parts are given the other parts are set to default.
	 * If no format us given, the standardformat of this locale is used.
	 * For example: HH:mm:ss -> 10 -> 10 hours
	 *
	 * @param  string|integer|array|Zend_Date  $time    Time to compare
	 * @param  string                          $format  OPTIONAL Timeformat for parsing input
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareTime($time, $format = null, $locale = null)
	{
		return $this->_time('cmp', $time, $format, $locale);
	}

	/**
	 * Returns a clone of $this, with the time part set to 00:00:00.
	 *
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getDate($locale = null)
	{
		$date = $this->copyPart(self::DATE_MEDIUM, $locale);
		$date->addTimestamp($this->getGmtOffset());
		return $date;
	}

	/**
	 * Returns the calculated date
	 *
	 * @param  string                          $calc    Calculation to make
	 * @param  string|integer|array|Zend_Date  $date    Date to calculate with, if null the actual date is taken
	 * @param  string                          $format  Date format for parsing
	 * @param  string|Zend_Locale              $locale  Locale for parsing input
	 * @return integer|Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	private function _date($calc, $date, $format, $locale)
	{
		if ($date === null) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('parameter $date must be set, null is not allowed');
		}

		if ($date instanceof Zend_Date) {
			// extract date from object
			$date = $date->get('d.M.Y');
		} else {
			if (is_array($date)) {
				if ((isset($date['year']) === true) or (isset($date['month']) === true) or
				(isset($date['day']) === true)) {
					$parsed = $date;
				} else {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("no day,month or year given in array");
				}
			} else {
				if (self::$_options['format_type'] == 'php') {
					$format = Zend_Locale_Format::convertPhpToIsoFormat($format);
				}
				try {
					if ($locale === null) {
						$locale = $this->getLocale();
					}

					$parsed = Zend_Locale_Format::getDate($date, array('date_format' => $format, 'locale' => $locale, 'format_type' => 'iso'));
					if ((strpos(strtoupper($format), 'YY') !== false) and (strpos(strtoupper($format), 'YYYY') === false)) {
						$parsed['year'] = self::getFullYear($parsed['year']);
					}
				} catch (Zend_Locale_Exception $e) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception($e->getMessage());
				}
			}
			$date  = $parsed['day'] . "." . $parsed['month'] . "." . $parsed['year'];
		}

		$return = $this->_calcdetail($calc, $date, self::DATE_MEDIUM, 'de');
		if ($calc != 'cmp') {
			return $this;
		}
		return $return;
	}


	/**
	 * Sets a new date for the date object. Format defines how to parse the date string.
	 * Also a complete date with time can be given, but only the date is used for setting.
	 * For example: MMMM.yy HH:mm-> May.07 22:11 => 01.May.07 00:00
	 * Returned is the new date object and the existing time is left as it was before
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date to set
	 * @param  string                          $format  OPTIONAL Date format for parsing
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer|Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setDate($date, $format = null, $locale = null)
	{
		return $this->_date('set', $date, $format, $locale);
	}


	/**
	 * Adds a date to the existing date object. Format defines how to parse the date string.
	 * If only parts are given the other parts are set to 0.
	 * If no format is given, the standardformat of this locale is used.
	 * For example: MM.dd.YYYY -> 10 -> +10 months
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date to add
	 * @param  string                          $format  OPTIONAL Date format for parsing input
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addDate($date, $format = null, $locale = null)
	{
		return $this->_date('add', $date, $format, $locale);
	}


	/**
	 * Subtracts a date from the existing date object. Format defines how to parse the date string.
	 * If only parts are given the other parts are set to 0.
	 * If no format is given, the standardformat of this locale is used.
	 * For example: MM.dd.YYYY -> 10 -> -10 months
	 * Be aware: Subtracting 2 months is not equal to Adding -2 months !!!
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date to sub
	 * @param  string                          $format  OPTIONAL Date format for parsing input
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subDate($date, $format = null, $locale = null)
	{
		return $this->_date('sub', $date, $format, $locale);
	}


	/**
	 * Compares the date from the existing date object, ignoring the time.
	 * Format defines how to parse the date string.
	 * If only parts are given the other parts are set to 0.
	 * If no format is given, the standardformat of this locale is used.
	 * For example: 10.01.2000 => 10.02.1999 -> false
	 *
	 * @param  string|integer|array|Zend_Date  $date    Date to compare
	 * @param  string                          $format  OPTIONAL Date format for parsing input
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function compareDate($date, $format = null, $locale = null)
	{
		return $this->_date('cmp', $date, $format, $locale);
	}


	/**
	 * Returns the full ISO 8601 date from the date object.
	 * Always the complete ISO 8601 specifiction is used. If an other ISO date is needed
	 * (ISO 8601 defines several formats) use toString() instead.
	 * This function does not return the ISO date as object. Use copy() instead.
	 *
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return string
	 */
	public function getIso($locale = null)
	{
		return $this->get(self::ISO_8601, $locale);
	}


	/**
	 * Sets a new date for the date object. Not given parts are set to default.
	 * Only supported ISO 8601 formats are accepted.
	 * For example: 050901 -> 01.Sept.2005 00:00:00, 20050201T10:00:30 -> 01.Feb.2005 10h00m30s
	 * Returned is the new date object
	 *
	 * @param  string|integer|Zend_Date  $date    ISO Date to set
	 * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
	 * @return integer|Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setIso($date, $locale = null)
	{
		return $this->_calcvalue('set', $date, 'iso', self::ISO_8601, $locale);
	}


	/**
	 * Adds a ISO date to the date object. Not given parts are set to default.
	 * Only supported ISO 8601 formats are accepted.
	 * For example: 050901 -> + 01.Sept.2005 00:00:00, 10:00:00 -> +10h
	 * Returned is the new date object
	 *
	 * @param  string|integer|Zend_Date  $date    ISO Date to add
	 * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
	 * @return integer|Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addIso($date, $locale = null)
	{
		return $this->_calcvalue('add', $date, 'iso', self::ISO_8601, $locale);
	}


	/**
	 * Subtracts a ISO date from the date object. Not given parts are set to default.
	 * Only supported ISO 8601 formats are accepted.
	 * For example: 050901 -> - 01.Sept.2005 00:00:00, 10:00:00 -> -10h
	 * Returned is the new date object
	 *
	 * @param  string|integer|Zend_Date  $date    ISO Date to sub
	 * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
	 * @return integer|Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subIso($date, $locale = null)
	{
		return $this->_calcvalue('sub', $date, 'iso', self::ISO_8601, $locale);
	}


	/**
	 * Compares a ISO date with the date object. Not given parts are set to default.
	 * Only supported ISO 8601 formats are accepted.
	 * For example: 050901 -> - 01.Sept.2005 00:00:00, 10:00:00 -> -10h
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|Zend_Date  $date    ISO Date to sub
	 * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareIso($date, $locale = null)
	{
		return $this->_calcvalue('cmp', $date, 'iso', self::ISO_8601, $locale);
	}


	/**
	 * Returns a RFC 822 compilant datestring from the date object.
	 * This function does not return the RFC date as object. Use copy() instead.
	 *
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return string
	 */
	public function getArpa($locale = null)
	{
		return $this->get(self::RFC_822, $locale);
	}


	/**
	 * Sets a RFC 822 date as new date for the date object.
	 * Only RFC 822 compilant date strings are accepted.
	 * For example: Sat, 14 Feb 09 00:31:30 +0100
	 * Returned is the new date object
	 *
	 * @param  string|integer|Zend_Date  $date    RFC 822 to set
	 * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
	 * @return integer|Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setArpa($date, $locale = null)
	{
		return $this->_calcvalue('set', $date, 'arpa', self::RFC_822, $locale);
	}


	/**
	 * Adds a RFC 822 date to the date object.
	 * ARPA messages are used in emails or HTTP Headers.
	 * Only RFC 822 compilant date strings are accepted.
	 * For example: Sat, 14 Feb 09 00:31:30 +0100
	 * Returned is the new date object
	 *
	 * @param  string|integer|Zend_Date  $date    RFC 822 Date to add
	 * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
	 * @return integer|Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addArpa($date, $locale = null)
	{
		return $this->_calcvalue('add', $date, 'arpa', self::RFC_822, $locale);
	}


	/**
	 * Subtracts a RFC 822 date from the date object.
	 * ARPA messages are used in emails or HTTP Headers.
	 * Only RFC 822 compilant date strings are accepted.
	 * For example: Sat, 14 Feb 09 00:31:30 +0100
	 * Returned is the new date object
	 *
	 * @param  string|integer|Zend_Date  $date    RFC 822 Date to sub
	 * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
	 * @return integer|Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subArpa($date, $locale = null)
	{
		return $this->_calcvalue('sub', $date, 'arpa', self::RFC_822, $locale);
	}


	/**
	 * Compares a RFC 822 compilant date with the date object.
	 * ARPA messages are used in emails or HTTP Headers.
	 * Only RFC 822 compilant date strings are accepted.
	 * For example: Sat, 14 Feb 09 00:31:30 +0100
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|Zend_Date  $date    RFC 822 Date to sub
	 * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareArpa($date, $locale = null)
	{
		return $this->_calcvalue('cmp', $date, 'arpa', self::RFC_822, $locale);
	}


	/**
	 * Check if location is supported
	 *
	 * @param $location array - locations array
	 * @return $horizon float
	 */
	private function _checkLocation($location)
	{
		if (!isset($location['longitude']) or !isset($location['latitude'])) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('Location must include \'longitude\' and \'latitude\'', $location);
		}
		if (($location['longitude'] > 180) or ($location['longitude'] < -180)) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('Longitude must be between -180 and 180', $location);
		}
		if (($location['latitude'] > 90) or ($location['latitude'] < -90)) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('Latitude must be between -90 and 90', $location);
		}

		if (!isset($location['horizon'])){
			$location['horizon'] = 'effective';
		}

		switch ($location['horizon']) {
			case 'civil' :
				return -0.104528;
				break;
			case 'nautic' :
				return -0.207912;
				break;
			case 'astronomic' :
				return -0.309017;
				break;
			default :
				return -0.0145439;
				break;
		}
	}


	/**
	 * Returns the time of sunrise for this date and a given location as new date object
	 * For a list of cities and correct locations use the class Zend_Date_Cities
	 *
	 * @param  $location array - location of sunrise
	 *                   ['horizon']   -> civil, nautic, astronomical, effective (default)
	 *                   ['longitude'] -> longitude of location
	 *                   ['latitude']  -> latitude of location
	 * @return Zend_Date
	 * @throws Zend_Date_Exception
	 */
	public function getSunrise($location)
	{
		$horizon = $this->_checkLocation($location);
		$result = clone $this;
		$result->set($this->calcSun($location, $horizon, true), self::TIMESTAMP);
		return $result;
	}


	/**
	 * Returns the time of sunset for this date and a given location as new date object
	 * For a list of cities and correct locations use the class Zend_Date_Cities
	 *
	 * @param  $location array - location of sunset
	 *                   ['horizon']   -> civil, nautic, astronomical, effective (default)
	 *                   ['longitude'] -> longitude of location
	 *                   ['latitude']  -> latitude of location
	 * @return Zend_Date
	 * @throws Zend_Date_Exception
	 */
	public function getSunset($location)
	{
		$horizon = $this->_checkLocation($location);
		$result = clone $this;
		$result->set($this->calcSun($location, $horizon, false), self::TIMESTAMP);
		return $result;
	}


	/**
	 * Returns an array with the sunset and sunrise dates for all horizon types
	 * For a list of cities and correct locations use the class Zend_Date_Cities
	 *
	 * @param  $location array - location of suninfo
	 *                   ['horizon']   -> civil, nautic, astronomical, effective (default)
	 *                   ['longitude'] -> longitude of location
	 *                   ['latitude']  -> latitude of location
	 * @return array - [sunset|sunrise][effective|civil|nautic|astronomic]
	 * @throws Zend_Date_Exception
	 */
	public function getSunInfo($location)
	{
		$suninfo = array();
		for ($i = 0; $i < 4; ++$i) {
			switch ($i) {
				case 0 :
					$location['horizon'] = 'effective';
					break;
				case 1 :
					$location['horizon'] = 'civil';
					break;
				case 2 :
					$location['horizon'] = 'nautic';
					break;
				case 3 :
					$location['horizon'] = 'astronomic';
					break;
			}
			$horizon = $this->_checkLocation($location);
			$result = clone $this;
			$result->set($this->calcSun($location, $horizon, true), self::TIMESTAMP);
			$suninfo['sunrise'][$location['horizon']] = $result;
			$result = clone $this;
			$result->set($this->calcSun($location, $horizon, false), self::TIMESTAMP);
			$suninfo['sunset'][$location['horizon']]  = $result;
		}
		return $suninfo;
	}


	/**
	 * Check a given year for leap year.
	 *
	 * @param  integer|array|Zend_Date  $year  Year to check
	 * @return boolean
	 */
	public static function checkLeapYear($year)
	{
		if ($year instanceof Zend_Date) {
			$year = (int) $year->get(self::YEAR);
		}
		if (is_array($year)) {
			if (isset($year['year']) === true) {
				$year = $year['year'];
			} else {
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("no year given in array");
			}
		}
		if (!is_numeric($year)) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("year ($year) has to be integer for checkLeapYear()", $year);
		}

		return (bool) parent::isYearLeapYear($year);
	}


	/**
	 * Returns true, if the year is a leap year.
	 *
	 * @return boolean
	 */
	public function isLeapYear()
	{
		return self::checkLeapYear($this);
	}


	/**
	 * Returns if the set date is todays date
	 *
	 * @return boolean
	 */
	public function isToday()
	{
		$today = $this->date('Ymd', $this->_getTime());
		$day   = $this->date('Ymd', $this->getUnixTimestamp());
		return ($today == $day);
	}


	/**
	 * Returns if the set date is yesterdays date
	 *
	 * @return boolean
	 */
	public function isYesterday()
	{
		list($year, $month, $day) = explode('-', $this->date('Y-m-d', $this->_getTime()));
		// adjusts for leap days and DST changes that are timezone specific
		$yesterday = $this->date('Ymd', $this->mktime(0, 0, 0, $month, $day -1, $year));
		$day   = $this->date('Ymd', $this->getUnixTimestamp());
		return $day == $yesterday;
	}


	/**
	 * Returns if the set date is tomorrows date
	 *
	 * @return boolean
	 */
	public function isTomorrow()
	{
		list($year, $month, $day) = explode('-', $this->date('Y-m-d', $this->_getTime()));
		// adjusts for leap days and DST changes that are timezone specific
		$tomorrow = $this->date('Ymd', $this->mktime(0, 0, 0, $month, $day +1, $year));
		$day   = $this->date('Ymd', $this->getUnixTimestamp());
		return $day == $tomorrow;
	}

	/**
	 * Returns the actual date as new date object
	 *
	 * @param  string|Zend_Locale        $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public static function now($locale = null)
	{
		return new Zend_Date(time(), self::TIMESTAMP, $locale);
	}

	/**
	 * Calculate date details
	 *
	 * @param  string                          $calc    Calculation to make
	 * @param  string|integer|array|Zend_Date  $date    Date or Part to calculate
	 * @param  string                          $part    Datepart for Calculation
	 * @param  string|Zend_Locale              $locale  Locale for parsing input
	 * @return integer|string  new date
	 * @throws Zend_Date_Exception
	 */
	private function _calcdetail($calc, $date, $type, $locale)
	{
		switch($calc) {
			case 'set' :
				return $this->set($date, $type, $locale);
				break;
			case 'add' :
				return $this->add($date, $type, $locale);
				break;
			case 'sub' :
				return $this->sub($date, $type, $locale);
				break;
		}
		return $this->compare($date, $type, $locale);
	}

	/**
	 * Internal calculation, returns the requested date type
	 *
	 * @param  string                    $calc    Calculation to make
	 * @param  string|integer|Zend_Date  $value   Datevalue to calculate with, if null the actual value is taken
	 * @param  string|Zend_Locale        $locale  Locale for parsing input
	 * @return integer|Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	private function _calcvalue($calc, $value, $type, $parameter, $locale)
	{
		if ($value === null) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("parameter $type must be set, null is not allowed");
		}

		if ($locale === null) {
			$locale = $this->getLocale();
		}

		if ($value instanceof Zend_Date) {
			// extract value from object
			$value = $value->get($parameter, $locale);
		} else if (!is_array($value) && !is_numeric($value) && ($type != 'iso') && ($type != 'arpa')) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("invalid $type ($value) operand", $value);
		}

		$return = $this->_calcdetail($calc, $value, $parameter, $locale);
		if ($calc != 'cmp') {
			return $this;
		}
		return $return;
	}


	/**
	 * Returns only the year from the date object as new object.
	 * For example: 10.May.2000 10:30:00 -> 01.Jan.2000 00:00:00
	 *
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getYear($locale = null)
	{
		return $this->copyPart(self::YEAR, $locale);
	}


	/**
	 * Sets a new year
	 * If the year is between 0 and 69, 2000 will be set (2000-2069)
	 * If the year if between 70 and 99, 1999 will be set (1970-1999)
	 * 3 or 4 digit years are set as expected. If you need to set year 0-99
	 * use set() instead.
	 * Returned is the new date object
	 *
	 * @param  string|integer|array|Zend_Date  $date    Year to set
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setYear($year, $locale = null)
	{
		return $this->_calcvalue('set', $year, 'year', self::YEAR, $locale);
	}


	/**
	 * Adds the year to the existing date object
	 * If the year is between 0 and 69, 2000 will be added (2000-2069)
	 * If the year if between 70 and 99, 1999 will be added (1970-1999)
	 * 3 or 4 digit years are added as expected. If you need to add years from 0-99
	 * use add() instead.
	 * Returned is the new date object
	 *
	 * @param  string|integer|array|Zend_Date  $date    Year to add
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addYear($year, $locale = null)
	{
		return $this->_calcvalue('add', $year, 'year', self::YEAR, $locale);
	}


	/**
	 * Subs the year from the existing date object
	 * If the year is between 0 and 69, 2000 will be subtracted (2000-2069)
	 * If the year if between 70 and 99, 1999 will be subtracted (1970-1999)
	 * 3 or 4 digit years are subtracted as expected. If you need to subtract years from 0-99
	 * use sub() instead.
	 * Returned is the new date object
	 *
	 * @param  string|integer|array|Zend_Date  $date    Year to sub
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subYear($year, $locale = null)
	{
		return $this->_calcvalue('sub', $year, 'year', self::YEAR, $locale);
	}


	/**
	 * Compares the year with the existing date object, ignoring other date parts.
	 * For example: 10.03.2000 -> 15.02.2000 -> true
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|array|Zend_Date  $year    Year to compare
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareYear($year, $locale = null)
	{
		return $this->_calcvalue('cmp', $year, 'year', self::YEAR, $locale);
	}


	/**
	 * Returns only the month from the date object as new object.
	 * For example: 10.May.2000 10:30:00 -> 01.May.1970 00:00:00
	 *
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getMonth($locale = null)
	{
		return $this->copyPart(self::MONTH, $locale);
	}


	/**
	 * Returns the calculated month
	 *
	 * @param  string                          $calc    Calculation to make
	 * @param  string|integer|array|Zend_Date  $month   Month to calculate with, if null the actual month is taken
	 * @param  string|Zend_Locale              $locale  Locale for parsing input
	 * @return integer|Zend_Date  new time
	 * @throws Zend_Date_Exception
	 */
	private function _month($calc, $month, $locale)
	{
		if ($month === null) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('parameter $month must be set, null is not allowed');
		}

		if ($locale === null) {
			$locale = $this->getLocale();
		}

		if ($month instanceof Zend_Date) {
			// extract month from object
			$found = $month->get(self::MONTH_SHORT, $locale);
		} else {
			if (is_numeric($month)) {
				$found = $month;
			} else if (is_array($month)) {
				if (isset($month['month']) === true) {
					$month = $month['month'];
				} else {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("no month given in array");
				}
			} else {
				$monthlist  = Zend_Locale_Data::getList($locale, 'month');
				$monthlist2 = Zend_Locale_Data::getList($locale, 'month', array('gregorian', 'format', 'abbreviated'));

				$monthlist = array_merge($monthlist, $monthlist2);
				$found = 0;
				$cnt = 0;
				foreach ($monthlist as $key => $value) {
					if (strtoupper($value) == strtoupper($month)) {
						$found = ($key % 12) + 1;
						break;
					}
					++$cnt;
				}
				if ($found == 0) {
					foreach ($monthlist2 as $key => $value) {
						if (strtoupper(iconv_substr($value, 0, 1, 'UTF-8')) == strtoupper($month)) {
							$found = $key + 1;
							break;
						}
						++$cnt;
					}
				}
				if ($found == 0) {
					require_once 'Zend/Date/Exception.php';
					throw new Zend_Date_Exception("unknown month name ($month)", $month);
				}
			}
		}
		$return = $this->_calcdetail($calc, $found, self::MONTH_SHORT, $locale);
		if ($calc != 'cmp') {
			return $this;
		}
		return $return;
	}


	/**
	 * Sets a new month
	 * The month can be a number or a string. Setting months lower then 0 and greater then 12
	 * will result in adding or subtracting the relevant year. (12 months equal one year)
	 * If a localized monthname is given it will be parsed with the default locale or the optional
	 * set locale.
	 * Returned is the new date object
	 *
	 * @param  string|integer|array|Zend_Date  $month   Month to set
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setMonth($month, $locale = null)
	{
		return $this->_month('set', $month, $locale);
	}


	/**
	 * Adds months to the existing date object.
	 * The month can be a number or a string. Adding months lower then 0 and greater then 12
	 * will result in adding or subtracting the relevant year. (12 months equal one year)
	 * If a localized monthname is given it will be parsed with the default locale or the optional
	 * set locale.
	 * Returned is the new date object
	 *
	 * @param  string|integer|array|Zend_Date  $month   Month to add
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addMonth($month, $locale = null)
	{
		return $this->_month('add', $month, $locale);
	}


	/**
	 * Subtracts months from the existing date object.
	 * The month can be a number or a string. Subtracting months lower then 0 and greater then 12
	 * will result in adding or subtracting the relevant year. (12 months equal one year)
	 * If a localized monthname is given it will be parsed with the default locale or the optional
	 * set locale.
	 * Returned is the new date object
	 *
	 * @param  string|integer|array|Zend_Date  $month   Month to sub
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subMonth($month, $locale = null)
	{
		return $this->_month('sub', $month, $locale);
	}


	/**
	 * Compares the month with the existing date object, ignoring other date parts.
	 * For example: 10.03.2000 -> 15.03.1950 -> true
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|array|Zend_Date  $month   Month to compare
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareMonth($month, $locale = null)
	{
		return $this->_month('cmp', $month, $locale);
	}


	/**
	 * Returns the day as new date object
	 * Example: 20.May.1986 -> 20.Jan.1970 00:00:00
	 *
	 * @param $locale  string|Zend_Locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getDay($locale = null)
	{
		return $this->copyPart(self::DAY_SHORT, $locale);
	}


	/**
	 * Returns the calculated day
	 *
	 * @param $calc    string                    Type of calculation to make
	 * @param $day     string|integer|Zend_Date  Day to calculate, when null the actual day is calculated
	 * @param $locale  string|Zend_Locale        Locale for parsing input
	 * @return Zend_Date|integer
	 */
	private function _day($calc, $day, $locale)
	{
		if ($day === null) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('parameter $day must be set, null is not allowed');
		}

		if ($locale === null) {
			$locale = $this->getLocale();
		}

		if ($day instanceof Zend_Date) {
			$day = $day->get(self::DAY_SHORT, $locale);
		}

		if (is_numeric($day)) {
			$type = self::DAY_SHORT;
		} else if (is_array($day)) {
			if (isset($day['day']) === true) {
				$day = $day['day'];
				$type = self::WEEKDAY;
			} else {
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("no day given in array");
			}
		} else {
			switch (iconv_strlen($day, 'UTF-8')) {
				case 1 :
					$type = self::WEEKDAY_NARROW;
					break;
				case 2:
					$type = self::WEEKDAY_NAME;
					break;
				case 3:
					$type = self::WEEKDAY_SHORT;
					break;
				default:
					$type = self::WEEKDAY;
					break;
			}
		}
		$return = $this->_calcdetail($calc, $day, $type, $locale);
		if ($calc != 'cmp') {
			return $this;
		}
		return $return;
	}


	/**
	 * Sets a new day
	 * The day can be a number or a string. Setting days lower then 0 or greater than the number of this months days
	 * will result in adding or subtracting the relevant month.
	 * If a localized dayname is given it will be parsed with the default locale or the optional
	 * set locale.
	 * Returned is the new date object
	 * Example: setDay('Montag', 'de_AT'); will set the monday of this week as day.
	 *
	 * @param  string|integer|array|Zend_Date  $month   Day to set
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setDay($day, $locale = null)
	{
		return $this->_day('set', $day, $locale);
	}


	/**
	 * Adds days to the existing date object.
	 * The day can be a number or a string. Adding days lower then 0 or greater than the number of this months days
	 * will result in adding or subtracting the relevant month.
	 * If a localized dayname is given it will be parsed with the default locale or the optional
	 * set locale.
	 * Returned is the new date object
	 * Example: addDay('Montag', 'de_AT'); will add the number of days until the next monday
	 *
	 * @param  string|integer|array|Zend_Date  $month   Day to add
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addDay($day, $locale = null)
	{
		return $this->_day('add', $day, $locale);
	}


	/**
	 * Subtracts days from the existing date object.
	 * The day can be a number or a string. Subtracting days lower then 0 or greater than the number of this months days
	 * will result in adding or subtracting the relevant month.
	 * If a localized dayname is given it will be parsed with the default locale or the optional
	 * set locale.
	 * Returned is the new date object
	 * Example: subDay('Montag', 'de_AT'); will sub the number of days until the previous monday
	 *
	 * @param  string|integer|array|Zend_Date  $month   Day to sub
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subDay($day, $locale = null)
	{
		return $this->_day('sub', $day, $locale);
	}


	/**
	 * Compares the day with the existing date object, ignoring other date parts.
	 * For example: 'Monday', 'en' -> 08.Jan.2007 -> 0
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|array|Zend_Date  $day     Day to compare
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareDay($day, $locale = null)
	{
		return $this->_day('cmp', $day, $locale);
	}


	/**
	 * Returns the weekday as new date object
	 * Weekday is always from 1-7
	 * Example: 09-Jan-2007 -> 2 = Tuesday -> 02-Jan-1970 (when 02.01.1970 is also Tuesday)
	 *
	 * @param $locale  string|Zend_Locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getWeekday($locale = null)
	{
		return $this->copyPart(self::WEEKDAY, $locale);
	}


	/**
	 * Returns the calculated weekday
	 *
	 * @param  $calc     string                          Type of calculation to make
	 * @param  $weekday  string|integer|array|Zend_Date  Weekday to calculate, when null the actual weekday is calculated
	 * @param  $locale   string|Zend_Locale              Locale for parsing input
	 * @return Zend_Date|integer
	 * @throws Zend_Date_Exception
	 */
	private function _weekday($calc, $weekday, $locale)
	{
		if ($weekday === null) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('parameter $weekday must be set, null is not allowed');
		}

		if ($locale === null) {
			$locale = $this->getLocale();
		}

		if ($weekday instanceof Zend_Date) {
			$weekday = $weekday->get(self::WEEKDAY_8601, $locale);
		}

		if (is_numeric($weekday)) {
			$type = self::WEEKDAY_8601;
		} else if (is_array($weekday)) {
			if (isset($weekday['weekday']) === true) {
				$weekday = $weekday['weekday'];
				$type = self::WEEKDAY;
			} else {
				require_once 'Zend/Date/Exception.php';
				throw new Zend_Date_Exception("no weekday given in array");
			}
		} else {
			switch(iconv_strlen($weekday, 'UTF-8')) {
				case 1:
					$type = self::WEEKDAY_NARROW;
					break;
				case 2:
					$type = self::WEEKDAY_NAME;
					break;
				case 3:
					$type = self::WEEKDAY_SHORT;
					break;
				default:
					$type = self::WEEKDAY;
					break;
			}
		}
		$return = $this->_calcdetail($calc, $weekday, $type, $locale);
		if ($calc != 'cmp') {
			return $this;
		}
		return $return;
	}


	/**
	 * Sets a new weekday
	 * The weekday can be a number or a string. If a localized weekday name is given,
	 * then it will be parsed as a date in $locale (defaults to the same locale as $this).
	 * Returned is the new date object.
	 * Example: setWeekday(3); will set the wednesday of this week as day.
	 *
	 * @param  string|integer|array|Zend_Date  $month   Weekday to set
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setWeekday($weekday, $locale = null)
	{
		return $this->_weekday('set', $weekday, $locale);
	}


	/**
	 * Adds weekdays to the existing date object.
	 * The weekday can be a number or a string.
	 * If a localized dayname is given it will be parsed with the default locale or the optional
	 * set locale.
	 * Returned is the new date object
	 * Example: addWeekday(3); will add the difference of days from the begining of the month until
	 * wednesday.
	 *
	 * @param  string|integer|array|Zend_Date  $month   Weekday to add
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addWeekday($weekday, $locale = null)
	{
		return $this->_weekday('add', $weekday, $locale);
	}


	/**
	 * Subtracts weekdays from the existing date object.
	 * The weekday can be a number or a string.
	 * If a localized dayname is given it will be parsed with the default locale or the optional
	 * set locale.
	 * Returned is the new date object
	 * Example: subWeekday(3); will subtract the difference of days from the begining of the month until
	 * wednesday.
	 *
	 * @param  string|integer|array|Zend_Date  $month   Weekday to sub
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subWeekday($weekday, $locale = null)
	{
		return $this->_weekday('sub', $weekday, $locale);
	}


	/**
	 * Compares the weekday with the existing date object, ignoring other date parts.
	 * For example: 'Monday', 'en' -> 08.Jan.2007 -> 0
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|array|Zend_Date  $weekday  Weekday to compare
	 * @param  string|Zend_Locale              $locale   OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareWeekday($weekday, $locale = null)
	{
		return $this->_weekday('cmp', $weekday, $locale);
	}


	/**
	 * Returns the day of year as new date object
	 * Example: 02.Feb.1986 10:00:00 -> 02.Feb.1970 00:00:00
	 *
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getDayOfYear($locale = null)
	{
		return $this->copyPart(self::DAY_OF_YEAR, $locale);
	}


	/**
	 * Sets a new day of year
	 * The day of year is always a number.
	 * Returned is the new date object
	 * Example: 04.May.2004 -> setDayOfYear(10) -> 10.Jan.2004
	 *
	 * @param  string|integer|array|Zend_Date  $day     Day of Year to set
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setDayOfYear($day, $locale = null)
	{
		return $this->_calcvalue('set', $day, 'day of year', self::DAY_OF_YEAR, $locale);
	}


	/**
	 * Adds a day of year to the existing date object.
	 * The day of year is always a number.
	 * Returned is the new date object
	 * Example: addDayOfYear(10); will add 10 days to the existing date object.
	 *
	 * @param  string|integer|array|Zend_Date  $day     Day of Year to add
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addDayOfYear($day, $locale = null)
	{
		return $this->_calcvalue('add', $day, 'day of year', self::DAY_OF_YEAR, $locale);
	}


	/**
	 * Subtracts a day of year from the existing date object.
	 * The day of year is always a number.
	 * Returned is the new date object
	 * Example: subDayOfYear(10); will subtract 10 days from the existing date object.
	 *
	 * @param  string|integer|array|Zend_Date  $day     Day of Year to sub
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subDayOfYear($day, $locale = null)
	{
		return $this->_calcvalue('sub', $day, 'day of year', self::DAY_OF_YEAR, $locale);
	}


	/**
	 * Compares the day of year with the existing date object.
	 * For example: compareDayOfYear(33) -> 02.Feb.2007 -> 0
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|array|Zend_Date  $day     Day of Year to compare
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareDayOfYear($day, $locale = null)
	{
		return $this->_calcvalue('cmp', $day, 'day of year', self::DAY_OF_YEAR, $locale);
	}


	/**
	 * Returns the hour as new date object
	 * Example: 02.Feb.1986 10:30:25 -> 01.Jan.1970 10:00:00
	 *
	 * @param $locale  string|Zend_Locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getHour($locale = null)
	{
		return $this->copyPart(self::HOUR, $locale);
	}


	/**
	 * Sets a new hour
	 * The hour is always a number.
	 * Returned is the new date object
	 * Example: 04.May.1993 13:07:25 -> setHour(7); -> 04.May.1993 07:07:25
	 *
	 * @param  string|integer|array|Zend_Date  $hour    Hour to set
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setHour($hour, $locale = null)
	{
		return $this->_calcvalue('set', $hour, 'hour', self::HOUR_SHORT, $locale);
	}


	/**
	 * Adds hours to the existing date object.
	 * The hour is always a number.
	 * Returned is the new date object
	 * Example: 04.May.1993 13:07:25 -> addHour(12); -> 05.May.1993 01:07:25
	 *
	 * @param  string|integer|array|Zend_Date  $hour    Hour to add
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addHour($hour, $locale = null)
	{
		return $this->_calcvalue('add', $hour, 'hour', self::HOUR_SHORT, $locale);
	}


	/**
	 * Subtracts hours from the existing date object.
	 * The hour is always a number.
	 * Returned is the new date object
	 * Example: 04.May.1993 13:07:25 -> subHour(6); -> 05.May.1993 07:07:25
	 *
	 * @param  string|integer|array|Zend_Date  $hour    Hour to sub
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subHour($hour, $locale = null)
	{
		return $this->_calcvalue('sub', $hour, 'hour', self::HOUR_SHORT, $locale);
	}


	/**
	 * Compares the hour with the existing date object.
	 * For example: 10:30:25 -> compareHour(10) -> 0
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|array|Zend_Date  $hour    Hour to compare
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareHour($hour, $locale = null)
	{
		return $this->_calcvalue('cmp', $hour, 'hour', self::HOUR_SHORT, $locale);
	}


	/**
	 * Returns the minute as new date object
	 * Example: 02.Feb.1986 10:30:25 -> 01.Jan.1970 00:30:00
	 *
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getMinute($locale = null)
	{
		return $this->copyPart(self::MINUTE, $locale);
	}


	/**
	 * Sets a new minute
	 * The minute is always a number.
	 * Returned is the new date object
	 * Example: 04.May.1993 13:07:25 -> setMinute(29); -> 04.May.1993 13:29:25
	 *
	 * @param  string|integer|array|Zend_Date  $minute  Minute to set
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setMinute($minute, $locale = null)
	{
		return $this->_calcvalue('set', $minute, 'minute', self::MINUTE_SHORT, $locale);
	}


	/**
	 * Adds minutes to the existing date object.
	 * The minute is always a number.
	 * Returned is the new date object
	 * Example: 04.May.1993 13:07:25 -> addMinute(65); -> 04.May.1993 13:12:25
	 *
	 * @param  string|integer|array|Zend_Date  $minute  Minute to add
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addMinute($minute, $locale = null)
	{
		return $this->_calcvalue('add', $minute, 'minute', self::MINUTE_SHORT, $locale);
	}


	/**
	 * Subtracts minutes from the existing date object.
	 * The minute is always a number.
	 * Returned is the new date object
	 * Example: 04.May.1993 13:07:25 -> subMinute(9); -> 04.May.1993 12:58:25
	 *
	 * @param  string|integer|array|Zend_Date  $minute  Minute to sub
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subMinute($minute, $locale = null)
	{
		return $this->_calcvalue('sub', $minute, 'minute', self::MINUTE_SHORT, $locale);
	}


	/**
	 * Compares the minute with the existing date object.
	 * For example: 10:30:25 -> compareMinute(30) -> 0
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|array|Zend_Date  $minute  Hour to compare
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareMinute($minute, $locale = null)
	{
		return $this->_calcvalue('cmp', $minute, 'minute', self::MINUTE_SHORT, $locale);
	}


	/**
	 * Returns the second as new date object
	 * Example: 02.Feb.1986 10:30:25 -> 01.Jan.1970 00:00:25
	 *
	 * @param  string|Zend_Locale  $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getSecond($locale = null)
	{
		return $this->copyPart(self::SECOND, $locale);
	}


	/**
	 * Sets new seconds to the existing date object.
	 * The second is always a number.
	 * Returned is the new date object
	 * Example: 04.May.1993 13:07:25 -> setSecond(100); -> 04.May.1993 13:08:40
	 *
	 * @param  string|integer|array|Zend_Date $second Second to set
	 * @param  string|Zend_Locale             $locale (Optional) Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function setSecond($second, $locale = null)
	{
		return $this->_calcvalue('set', $second, 'second', self::SECOND_SHORT, $locale);
	}


	/**
	 * Adds seconds to the existing date object.
	 * The second is always a number.
	 * Returned is the new date object
	 * Example: 04.May.1993 13:07:25 -> addSecond(65); -> 04.May.1993 13:08:30
	 *
	 * @param  string|integer|array|Zend_Date $second Second to add
	 * @param  string|Zend_Locale             $locale (Optional) Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function addSecond($second, $locale = null)
	{
		return $this->_calcvalue('add', $second, 'second', self::SECOND_SHORT, $locale);
	}


	/**
	 * Subtracts seconds from the existing date object.
	 * The second is always a number.
	 * Returned is the new date object
	 * Example: 04.May.1993 13:07:25 -> subSecond(10); -> 04.May.1993 13:07:15
	 *
	 * @param  string|integer|array|Zend_Date $second Second to sub
	 * @param  string|Zend_Locale             $locale (Optional) Locale for parsing input
	 * @return Zend_Date  new date
	 * @throws Zend_Date_Exception
	 */
	public function subSecond($second, $locale = null)
	{
		return $this->_calcvalue('sub', $second, 'second', self::SECOND_SHORT, $locale);
	}


	/**
	 * Compares the second with the existing date object.
	 * For example: 10:30:25 -> compareSecond(25) -> 0
	 * Returns if equal, earlier or later
	 *
	 * @param  string|integer|array|Zend_Date $second Second to compare
	 * @param  string|Zend_Locale             $locale (Optional) Locale for parsing input
	 * @return integer  0 = equal, 1 = later, -1 = earlier
	 * @throws Zend_Date_Exception
	 */
	public function compareSecond($second, $locale = null)
	{
		return $this->_calcvalue('cmp', $second, 'second', self::SECOND_SHORT, $locale);
	}


	/**
	 * Returns the precision for fractional seconds
	 *
	 * @return integer
	 */
	public function getFractionalPrecision()
	{
		return $this->_precision;
	}


	/**
	 * Sets a new precision for fractional seconds
	 *
	 * @param  integer $precision Precision for the fractional datepart 3 = milliseconds
	 * @throws Zend_Date_Exception
	 * @return void
	 */
	public function setFractionalPrecision($precision)
	{
		if (!intval($precision) or ($precision < 0) or ($precision > 9)) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("precision ($precision) must be a positive integer less than 10", $precision);
		}
		$this->_precision = (int) $precision;
	}


	/**
	 * Returns the milliseconds of the date object
	 *
	 * @return integer
	 */
	public function getMilliSecond()
	{
		return $this->_fractional;
	}


	/**
	 * Sets new milliseconds for the date object
	 * Example: setMilliSecond(550, 2) -> equals +5 Sec +50 MilliSec
	 *
	 * @param  integer|Zend_Date $milli     (Optional) Millisecond to set, when null the actual millisecond is set
	 * @param  integer           $precision (Optional) Fraction precision of the given milliseconds
	 * @return integer|string
	 */
	public function setMilliSecond($milli = null, $precision = null)
	{
		if ($milli === null) {
			list($milli, $time) = explode(" ", microtime());
			$milli = intval($milli);
			$precision = 6;
		} else if (!is_numeric($milli)) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("invalid milli second ($milli) operand", $milli);
		}

		if ($precision === null) {
			$precision = $this->_precision;
		} else if (!is_int($precision) || $precision < 1 || $precision > 9) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("precision ($precision) must be a positive integer less than 10", $precision);
		}

		$this->_fractional = 0;
		$this->addMilliSecond($milli, $precision);
		return $this->_fractional;
	}


	/**
	 * Adds milliseconds to the date object
	 *
	 * @param  integer|Zend_Date $milli     (Optional) Millisecond to add, when null the actual millisecond is added
	 * @param  integer           $precision (Optional) Fractional precision for the given milliseconds
	 * @return integer|string
	 */
	public function addMilliSecond($milli = null, $precision = null)
	{
		if ($milli === null) {
			list($milli, $time) = explode(" ", microtime());
			$milli = intval($milli);
		} else if (!is_numeric($milli)) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("invalid milli second ($milli) operand", $milli);
		}

		if ($precision === null) {
			$precision = $this->_precision;
		} else if (!is_int($precision) || $precision < 1 || $precision > 9) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("precision ($precision) must be a positive integer less than 10", $precision);
		}

		if ($precision != $this->_precision) {
			if ($precision > $this->_precision) {
				$diff = $precision - $this->_precision;
				$milli = (int) ($milli / (10 * $diff));
			} else {
				$diff = $this->_precision - $precision;
				$milli = (int) ($milli * (10 * $diff));
			}
		}

		$this->_fractional += $milli;
		// Add/sub milliseconds + add/sub seconds

		$max = pow(10, $this->_precision);
		// Milli includes seconds
		if ($this->_fractional >= $max) {
			while ($this->_fractional >= $max) {
				$this->addSecond(1);
				$this->_fractional -= $max;
			}
		}

		if ($this->_fractional < 0) {
			while ($this->_fractional < 0) {
				$this->subSecond(1);
				$this->_fractional += $max;
			}
		}

		return $this->_fractional;
	}


	/**
	 * Subtracts a millisecond
	 *
	 * @param  integer|Zend_Date $milli     (Optional) Millisecond to sub, when null the actual millisecond is subtracted
	 * @param  integer           $precision (Optional) Fractional precision for the given milliseconds
	 * @return integer
	 */
	public function subMilliSecond($milli = null, $precision = null)
	{
		return $this->addMilliSecond(0 - $milli, $precision);
	}

	/**
	 * Compares only the millisecond part, returning the difference
	 *
	 * @param  integer|Zend_Date  $milli  OPTIONAL Millisecond to compare, when null the actual millisecond is compared
	 * @param  integer            $precision  OPTIONAL Fractional precision for the given milliseconds
	 * @return integer
	 */
	public function compareMilliSecond($milli = null, $precision = null)
	{
		if ($milli === null) {
			list($milli, $time) = explode(" ", microtime());
			$milli = intval($milli);
		} else if (is_numeric($milli) === false) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("invalid milli second ($milli) operand", $milli);
		}

		if ($precision === null) {
			$precision = $this->_precision;
		} else if (!is_int($precision) || $precision < 1 || $precision > 9) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception("precision ($precision) must be a positive integer less than 10", $precision);
		}

		if ($precision === 0) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception('precision is 0');
		}

		if ($precision != $this->_precision) {
			if ($precision > $this->_precision) {
				$diff = $precision - $this->_precision;
				$milli = (int) ($milli / (10 * $diff));
			} else {
				$diff = $this->_precision - $precision;
				$milli = (int) ($milli * (10 * $diff));
			}
		}

		$comp = $this->_fractional - $milli;
		if ($comp < 0) {
			return -1;
		} else if ($comp > 0) {
			return 1;
		}
		return 0;
	}

	/**
	 * Returns the week as new date object using monday as begining of the week
	 * Example: 12.Jan.2007 -> 08.Jan.1970 00:00:00
	 *
	 * @param $locale  string|Zend_Locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 */
	public function getWeek($locale = null)
	{
		return $this->copyPart(self::WEEK, $locale);
	}

	/**
	 * Sets a new week. The week is always a number. The day of week is not changed.
	 * Returned is the new date object
	 * Example: 09.Jan.2007 13:07:25 -> setWeek(1); -> 02.Jan.2007 13:07:25
	 *
	 * @param  string|integer|array|Zend_Date  $week    Week to set
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 * @throws Zend_Date_Exception
	 */
	public function setWeek($week, $locale = null)
	{
		return $this->_calcvalue('set', $week, 'week', self::WEEK, $locale);
	}

	/**
	 * Adds a week. The week is always a number. The day of week is not changed.
	 * Returned is the new date object
	 * Example: 09.Jan.2007 13:07:25 -> addWeek(1); -> 16.Jan.2007 13:07:25
	 *
	 * @param  string|integer|array|Zend_Date  $week    Week to add
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 * @throws Zend_Date_Exception
	 */
	public function addWeek($week, $locale = null)
	{
		return $this->_calcvalue('add', $week, 'week', self::WEEK, $locale);
	}

	/**
	 * Subtracts a week. The week is always a number. The day of week is not changed.
	 * Returned is the new date object
	 * Example: 09.Jan.2007 13:07:25 -> subWeek(1); -> 02.Jan.2007 13:07:25
	 *
	 * @param  string|integer|array|Zend_Date  $week    Week to sub
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return Zend_Date
	 * @throws Zend_Date_Exception
	 */
	public function subWeek($week, $locale = null)
	{
		return $this->_calcvalue('sub', $week, 'week', self::WEEK, $locale);
	}

	/**
	 * Compares only the week part, returning the difference
	 * Returned is the new date object
	 * Returns if equal, earlier or later
	 * Example: 09.Jan.2007 13:07:25 -> compareWeek(2); -> 0
	 *
	 * @param  string|integer|array|Zend_Date  $week    Week to compare
	 * @param  string|Zend_Locale              $locale  OPTIONAL Locale for parsing input
	 * @return integer 0 = equal, 1 = later, -1 = earlier
	 */
	public function compareWeek($week, $locale = null)
	{
		return $this->_calcvalue('cmp', $week, 'week', self::WEEK, $locale);
	}

	/**
	 * Sets a new standard locale for the date object.
	 * This locale will be used for all functions
	 * Returned is the really set locale.
	 * Example: 'de_XX' will be set to 'de' because 'de_XX' does not exist
	 * 'xx_YY' will be set to 'root' because 'xx' does not exist
	 *
	 * @param  string|Zend_Locale $locale (Optional) Locale for parsing input
	 * @throws Zend_Date_Exception When the given locale does not exist
	 * @return Zend_Date Provides fluent interface
	 */
	public function setLocale($locale = null)
	{
		try {
			$this->_locale = Zend_Locale::findLocale($locale);
		} catch (Zend_Locale_Exception $e) {
			require_once 'Zend/Date/Exception.php';
			throw new Zend_Date_Exception($e->getMessage());
		}

		return $this;
	}

	/**
	 * Returns the actual set locale
	 *
	 * @return string
	 */
	public function getLocale()
	{
		return $this->_locale;
	}

	/**
	 * Checks if the given date is a real date or datepart.
	 * Returns false if a expected datepart is missing or a datepart exceeds its possible border.
	 * But the check will only be done for the expected dateparts which are given by format.
	 * If no format is given the standard dateformat for the actual locale is used.
	 * f.e. 30.February.2007 will return false if format is 'dd.MMMM.YYYY'
	 *
	 * @param  string|array|Zend_Date $date   Date to parse for correctness
	 * @param  string                 $format (Optional) Format for parsing the date string
	 * @param  string|Zend_Locale     $locale (Optional) Locale for parsing date parts
	 * @return boolean                True when all date parts are correct
	 */
	public static function isDate($date, $format = null, $locale = null)
	{
		if (!is_string($date) && !is_numeric($date) && !($date instanceof Zend_Date) &&
		!is_array($date)) {
			return false;
		}

		if (($format !== null) and (Zend_Locale::isLocale($format, null, false))) {
			$locale = $format;
			$format = null;
		}

		$locale = Zend_Locale::findLocale($locale);

		if ($format === null) {
			$format = Zend_Locale_Format::getDateFormat($locale);
		} else if (self::$_options['format_type'] == 'php') {
			$format = Zend_Locale_Format::convertPhpToIsoFormat($format);
		}

		$format = self::_getLocalizedToken($format, $locale);
		if (!is_array($date)) {
			try {
				$parsed = Zend_Locale_Format::getDate($date, array('locale' => $locale,
                                                      'date_format' => $format, 'format_type' => 'iso',
                                                      'fix_date' => false));
			} catch (Zend_Locale_Exception $e) {
				// Date can not be parsed
				return false;
			}
		} else {
			$parsed = $date;
		}

		if (((strpos($format, 'Y') !== false) or (strpos($format, 'y') !== false)) and
		(!isset($parsed['year']))) {
			// Year expected but not found
			return false;
		}

		if ((strpos($format, 'M') !== false) and (!isset($parsed['month']))) {
			// Month expected but not found
			return false;
		}

		if ((strpos($format, 'd') !== false) and (!isset($parsed['day']))) {
			// Day expected but not found
			return false;
		}

		if (((strpos($format, 'H') !== false) or (strpos($format, 'h') !== false)) and
		(!isset($parsed['hour']))) {
			// Hour expected but not found
			return false;
		}

		if ((strpos($format, 'm') !== false) and (!isset($parsed['minute']))) {
			// Minute expected but not found
			return false;
		}

		if ((strpos($format, 's') !== false) and (!isset($parsed['second']))) {
			// Second expected  but not found
			return false;
		}

		// Set not given dateparts
		if (isset($parsed['hour']) === false) {
			$parsed['hour'] = 12;
		}

		if (isset($parsed['minute']) === false) {
			$parsed['minute'] = 0;
		}

		if (isset($parsed['second']) === false) {
			$parsed['second'] = 0;
		}

		if (isset($parsed['month']) === false) {
			$parsed['month'] = 1;
		}

		if (isset($parsed['day']) === false) {
			$parsed['day'] = 1;
		}

		if (isset($parsed['year']) === false) {
			$parsed['year'] = 1970;
		}

		if (self::isYearLeapYear($parsed['year'])) {
			$parsed['year'] = 1972;
		} else {
			$parsed['year'] = 1971;
		}

		$date      = new self($parsed, null, $locale);
		$timestamp = $date->mktime($parsed['hour'], $parsed['minute'], $parsed['second'],
		$parsed['month'], $parsed['day'], $parsed['year']);

		if ($parsed['year'] != $date->date('Y', $timestamp)) {
			// Given year differs from parsed year
			return false;
		}

		if ($parsed['month'] != $date->date('n', $timestamp)) {
			// Given month differs from parsed month
			return false;
		}

		if ($parsed['day'] != $date->date('j', $timestamp)) {
			// Given day differs from parsed day
			return false;
		}

		if ($parsed['hour'] != $date->date('G', $timestamp)) {
			// Given hour differs from parsed hour
			return false;
		}

		if ($parsed['minute'] != $date->date('i', $timestamp)) {
			// Given minute differs from parsed minute
			return false;
		}

		if ($parsed['second'] != $date->date('s', $timestamp)) {
			// Given second differs from parsed second
			return false;
		}

		return true;
	}

	/**
	 * Returns the ISO Token for all localized constants
	 *
	 * @param string $token Token to normalize
	 * @param string $locale Locale to search
	 * @return string
	 */
	protected static function _getLocalizedToken($token, $locale)
	{
		switch($token) {
			case self::ISO_8601 :
				return "dd mm yy";
				break;
			case self::RFC_2822 :
				return "EEE, dd MMM yyyy HH:mm:ss";
				break;
			case self::DATES :
				return Zend_Locale_Data::getContent($locale, 'date');
				break;
			case self::DATE_FULL :
				return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'full'));
				break;
			case self::DATE_LONG :
				return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'long'));
				break;
			case self::DATE_MEDIUM :
				return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'medium'));
				break;
			case self::DATE_SHORT :
				return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'short'));
				break;
			case self::TIMES :
				return Zend_Locale_Data::getContent($locale, 'date');
				break;
			case self::TIME_FULL :
				return Zend_Locale_Data::getContent($locale, 'time', array('gregorian', 'full'));
				break;
			case self::TIME_LONG :
				return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'long'));
				break;
			case self::TIME_MEDIUM :
				return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'medium'));
				break;
			case self::TIME_SHORT :
				return Zend_Locale_Data::getContent($locale, 'date', array('gregorian', 'short'));
				break;
			case self::DATETIME :
				return Zend_Locale_Data::getContent($locale, 'datetime');
				break;
			case self::DATETIME_FULL :
				return Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'full'));
				break;
			case self::DATETIME_LONG :
				return Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'long'));
				break;
			case self::DATETIME_MEDIUM :
				return Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'medium'));
				break;
			case self::DATETIME_SHORT :
				return Zend_Locale_Data::getContent($locale, 'datetime', array('gregorian', 'short'));
				break;
			case self::ATOM :
			case self::RFC_3339 :
			case self::W3C :
				return "yyyy-MM-DD HH:mm:ss";
				break;
			case self::COOKIE :
			case self::RFC_850 :
				return "EEEE, dd-MM-yyyy HH:mm:ss";
				break;
			case self::RFC_822 :
			case self::RFC_1036 :
			case self::RFC_1123 :
			case self::RSS :
				return "EEE, dd MM yyyy HH:mm:ss";
				break;
		}

		return $token;
	}
}
